Questions tagged [power]

Electrical power is essential to the operation of any computer and any of its components or peripherals.

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dell t620 dc power supply [closed]

I recently got a poweredge t620 from my last job, was bound for the trash and it works great for my home lab. I'm wanting to go solar with battery backup and power some other things with the panels as ...
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Column/Row management in Power Query

I have a .txt file with loads of data in it. I have it loaded into Power Query thusly: [let a letter (A) equal a row of data, one column wide] A B C D E A B E A E A B C D E and so on... I would like ...
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Bluetooth suddenly gone - "Unknown USB device needs more power than the Port can Supply"

A few days ago I suddenly started receiving the "Unknown USB device needs more power than the Port can Supply"-error on my Lenovo Yoga 910 running Windows 11. At the same time my computer ...
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Why does the state of my laptop's battery keep switching between `Connected standby` and `Active` even though the laptop is always plugged-in?

I ran powercfg /batteryreport in powershell to view my laptop's battery report. The state of my laptop's battery keeps switching between Connected standby and Active even though the laptop is always ...
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Do CMOS batteries drain faster depending on how long and often you use your PC?

I have recently been thinking about how the lifetime of CMOS batteries is related to the time percentage during which one's PC is up. Obviously, the amount of power consumed by CMOS boards is ...
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I have NEC laptop that have 7A/125V power cable with us plug and want to use us to eu plug adapter

First of all, I lived in Indonesia, so I'm sorry if my English is a bit confusing. I bought a japan used laptop that is sell in online store. and I got 7A/125V us plug power cable and 100~240V/1.8A 50-...
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What is the correct 4.5*3.0mm DC connector for Asus Vivobook Pro 16X?

I'm trying to find the correct DC plug adapter for my Asus Vivobook Pro 16X. According to this non-official site it uses the 4.5 * 3.0mm DC plug; I have physically measured the OEM charger plug on my ...
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I am sure there is electricity from the power supply, but the device won't power up

For someone without an electrical engineering background, I've searched this issue online but couldn't find satisfying answers, so I'm asking it here. I have had this issue multiple times in the past. ...
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Dead? Motherboard

Ok, let's begin. A couple of weeks ago, My Lenovo Thinkpad X300 (2008) crapped out suddenly. I opened it up and inspected the components, nothing. Upon reopening I noticed that the DC jack was ...
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If my PC doesn't "turn on" randomly, what is that a sign of?

2.7 years ago, I bought a HP Z240 tower workstation PC. Recently, I have begun noticing that, when I press the power button in the morning, it doesn't "fully power on", or something similar. ...
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Linux--What program is responsible for the "Battery Low" notification, when I have plenty of battery left?

Using Linux, Devuan Release 4 chimaera (Debian derivative--non-systemd, parallel to Bullseye) I have a Thinkpad x220 laptop. The battery has plenty of power. I can keep the laptop on for a few hours, ...
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What are these components around the CPU socket?

Right next to the CPU socket, on the left and the top, you can first see a row of silver caps and behind these are little dark grey "boxes". What are those components and why do they get ...
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How to turn off USB-C charging while my HP ProBook 445 G7 is off?

On my HP ProBook 445 G7 I disabled quick boot in Windows, wake up on LAN and USB are also disabled in BIOS but the battery looses about 14% a week when it's shut down. When I connect my phone to the ...
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What would cause a fully powered off workstation to turn itself back on?

I have an old workstation that I want to keep fully powered off when I'm not around. Just recently I came home to find it powered on, even though I didn't touch it. There is no one else around (and ...
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Why does unplugging and plugging back in my laptop power cable result in a short, sharp, immediate speed boost to all processes?

So I've got a cheap, barebones Lenovo Windows 10 laptop and I've noticed a fascinating behaviour whenever I toggle (unplug and then immediately plug back in) the power cable: I get an immediate burst ...
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i5 desktop new power supply turns on but wont stay on

Beforehand the PC turned off and had difficulty turning on at all. Now with the new power supply it turns on normally but does not stay on. Sometimes it will turn on then turn off and start again ...
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would disabling a GPU in windows reduce a laptop's power consumption?

So let's say I have a laptop (ThinkPad P15 Gen 2) with a 230W power adapter, a 140W NVIDIA RTX A5000 Max-Q 16GB GDDR6 and an 11th Generation Intel Core i9-11950H Processor with vPro. Let's also say I'...
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Laptop doesn't turn on after unusual sudden black screen

I was using my laptop (without my charger, with battery at 72%). I decided to plug in my charger as the task I was doing would drain my battery lower (3D Modeling in Blender), as soon as I plugged in ...
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Power rating of USB 3 type A and type C

Almost all modern motherboards have a type c connector on the I/O Shield. I checked many manufacturers but they do not state how much power delivers through this tyoe c connector. I know a normal USB2 ...
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How to turn off internal Intel NUC light?

I have 10th gen Intel NUC. When turned off there is visible internal yellowish-greenish light. I would like to turn it off (light) -- how to do it? I am not concerned with light pollution but power ...
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PC Shuts Down Before 10% and Battery Test Shows Battery Capacity Reduction

I recently purchased a new Li-ion battery for my HP Probook 4520s PC which claims to be 5200mAh/58Wh. When I ran battery scan with windows powershell, I saw that the capacity was 45Wh. I was directed ...
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Linux embedded system: detect power on USB (as USB device)

I'm working on a Linux embedded system that can draw its power from two distinct sources: a dedicated power supply power supply through USB (connected to an external USB host) I must know when the ...
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Laptop touchpad problems when PSU charger (Original) is plugged in

I have an HP laptop which battery is damaged since February of 2021. HP DIAGNOSTIC TOOLS tells me that battery internal capacity is only at 10% of its factory capacity. The battery is also inflated. I ...
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HP ZBook laptop doesn't turn on after shutdown

I have an HP ZBook Fury 17 G7 Mobile Workstation. Today I shut it down, but when I later pressed the power button to turn it on nothing happened - no lights, nothing. How do I fix this, if possible?
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Modem recycles when power goes out although it's on a UPS

I have a UPS with my desktop, server, router and modem all on the backup side but when the power flickers, the fios modem still powers off. It is the only thing that powers off. Anyone know why or ...
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How to disable the power button on Windows 10?

I have the following settings set in my Power Options settings: However, it still does not stop my computer from being turned off when the power button is pressed. My cat often jumps onto my computer ...
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How bad are minor power fluctuations for computers?

Whenever a large appliance or power-tool is turned on where I live, such as a refrigerator, vacuum, chainsaw or similar, light-bulbs will often dim down for a fraction of a second before returning ...
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How to turn computer on within same LAN via command prompt in Windows 10?

Let's say Wakeup On LAN has been enabled in BIOS on pc01, and it's offline. Now I want to bring pc01 online via command prompt from pc02. Both computers on same LAN. What's the command I could use on ...
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Power button not working and power light not lighting up after Lenovo Yoga 730 13IKB reassembly

I bought a iFixit computer repair kit and opened up my old Lenovo Yoga 730 13IKB. I had intended to replace the battery until I realized that I had bought the wrong battery. But I was still curious, ...
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Different results for power measurement on ubuntu using powertop and energy_uj

I want to measure power usage of the whole PC in software on Linux. I've tried these two methods from here and here: using powertop: rm -f powertop.csv sudo powertop -q -t 60 -C powertop.csv cat ...
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Using a 6 amp connector instead of the 16 amps provided in Power Supply box ( Corsair RM850)

I purchased a corsair RM850 which comes in the box with a 16 amp power cable to plug into the home socket. Problem is that I do not have a 16Amp socket in any of my walls. There are 2 questions which ...
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USB 2.0 ports turning off after lid is closed on Asus Vivobook Laptop

So recently I've been using my laptop in "Dock mode" I get home, plug in the HDMI cable, a mouse and a keyboard. I then close the lid and use the computer normaly. However, since this ...
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How to know if my power supply need to replace or not? Sometimes it won’t start or freezes for no reason

How to know if my power supply need to replace or not? Sometimes my PC won’t start and I get a black screen and I need to power it on again. Sometimes the PIC will freeze and need restart. I have run ...
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Will a laptop run if the power source outputs lower current?

I need to work at a location where the power points output only ~2A (it is all solar). The power brick with my laptop says it takes 2.35A input. Will this be fine? What if I add an external monitor ...
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New Windows 10 install power plans not showing up as expected

I purchased a new laptop recently and the power plans aren't acting like I expect from a new Windows 10 install. A fresh install typically just has one power plan and I can add several more using ...
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Mac - VirtualBox slow when unfocused

I am on a Mac laptop running Win10 in VirtualBox. I have noticed a degradation in performance of the VM when the VirtualBox VM window is not the focused window on the Mac. To be clear, this happens ...
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Can you run a laptop with a dead battery using only a power bank of appropriate size?

I have a MacBook Air (13", early 2014) with a dead battery (won't accept charge). I currently run it using the MagSafe power adapter. However, the magnetic connector is too easily disconnected ...
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Slow Wattage of Thinkpad T480 Charger

Here are the problems I have with my T480: The "Slow Charger" warning appears in Windows. I tested several chargers on Windows and Linux that support at least 65W, but Lenovo Vantage and ...
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Why is my laptop not charging? The led indicater does not light up but the laptop thinks it plugged in

I have a Elitebook 820 G3 laptop. As far as I could tell the battery held charge well until it suddenly stopped charging. When plugged in the led charging indicator does not light up. However the ...
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Is there a convenient solution to go from PDF to excel?

I receive these god awful invoices in the form of faxes. We are in the process of implementing EDI however this is how it has to be done for the next few months. The employee i have entering the data ...
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Is it possible for DPI Scaling in windows 8, 8.1, and 7 with a common script(Powershell or anything)?

I tried following this link : Is it possible to change display scaling via command line? There is a binary provided in one of the answers in this above link which is this: https://github.com/imniko/...
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powercfg: If the Current DC Power Setting Index is 1 does that mean DC USB devices still have selective sleep enabled?

There is a USB device on my Windows 10 (Build 21H1) that falls asleep but should not. When I look at the Power Profile in the GUI it's set to Disabled. I ran powercfg /Q <uuid-of-active-power-...
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How to save power on a PC that is used for remote backups

I want to set up a NUC style PC to act as a recipient for backups when I travel. I will have it on a UPS and two large backup drives attached, but no monitor or keyboard or anything else attached. ...
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What power adapter does this TechCode wireless handheld barcode scanner need?

In 2014 I bought a "TechCode" handheld wireless barcode scanner from a large online retailer. I tested it after purchase and saw that it worked. Having now moved house, I can't find its ...
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Computer Starts Itself With No Discernable Cause or Consistency

PC has been randomly booting itself with no seeming consistency; It started months after I built it with no change in Power Config, etc. All Wake Timers, Automatic Updates, Wake-on-LAN, etc disabled ...
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Ubuntu 20 not coming up after hibernating or sleep mode

my ubuntu 20.x.x doesn't come up when it sleeps or hibernate and when i power off, the display goes off but my i can still hear my hard-drive spining (the indicator by the side of the laptop is still ...
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Mac Hibernate Sleep Mode, quiet and no hard drive sounds

I have MacBook Pro 15-inch, 2018, MacOS Monterey 12.1 . Everytime, I press Apple--> Sleep, I sometimes here churning/hard drive sounds. I want to make it so, it goes in totally quiet sleep mode, ...
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100% errors from memtest86 after series of power surges; more likely to be motherboard or RAM?

The power grid where I live is unreliable, and we frequently have interruptions (and presumably surges). I usually have a UPS protecting my desktop computer, but my prior UPS developed a fault and I ...
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How to measure instantaneous CPU power dissipation? [duplicate]

I would like to accurately measure the (instantaneous) electrical power that my laptop's CPU is dissipating. I don't want to measure the power draw of the entire machine using electrical measurement ...
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Dell Inspiron suddenly went blank and black - Clip Included

I was using it normally The screen suddenly went black out of nowhere What happens when I press power button I tried to turn it on The keyboard comes on for roughly 2 seconds But the screen stays ...
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