Questions tagged [power]

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

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28 views

Self-build pc won't get power

I'm trying to build a pc with only brand new bought components. After following everything by the guide of the motherboard, the pc won't turn on (pushing the button does nothing, not even a fan is ...
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DRAM Self-Refresh not the Lowest Power Mode

I have a DDR3L Samsung DRAM on my Laptop. Based on page 23 of its datasheet, IDD6 or the Self-Refresh current is much higher than IDD2P0, IDD2P1 and IDD3P, which are the Precharge/Active Power-Down ...
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I conncted my laptop to a power supply through an usb port. The power supply is 5v as the usb port.Did i damage it?

I have a cooling pad that draws power from the computer through an usb cable to work. To avoid discharging my computer, i used as a power supply my smartphone charger (removed the phone cable and ...
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How to measure/estimate the energy consumption of a PC? [closed]

Does someone know a method to estimate / measure the total energy consumption of a PC in specific conditions (during the test phase of the well-known CNN models) and in short periodes (every 1s)? So ...
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System Reserved partition has no volume and is hidden from disk management

Computer boots up on fourth or fifth attempt - error no boot device found The laptop is - A HP Notebook 15 with a AMD A8 processor. The hard disk replaced at birth (2016) with a Maxtor 480 Gig ...
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Power cycling SSD drive

My Crucial M4 SSD stopped working after I had shutdown irresponsive MacBook Pro. I've connected the drive to a USB enclosure but it's not detected by OS (a lamp on enclosure keeps lighting red, ...
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39 views

Can using lower rated battery damage device?

This question is exact oposite of this question Laptop specs lenovo G470 Battery specs Original ( which came with the original laptop i.e laptop in quetion)- Power rating- 11.1V-48Wh (P=VI , so i=4....
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82 views

Do I need a power strip with power-surge protection for a laptop?

There are simple power strips and power strips with surge protection (and also with short circuit protection). Is there difference in that matter for PCs and laptops? If I use laptop I have a battery (...
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Can a power supply incorrectly shutdown cause my graphics card to blow?

After someone unplugged my pc and rearranged the cords, I cannot get it to work on any monitor. I got a No Signal error so I had someone replace the graphics card which was blown. After this fix, he ...
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what is the eatx12v_2 power connector for on the asus prime z490-p

I have a asus prime z490-p and i am wondering what the eatx12v_2 power connector is for and if it is needed for my build? Thanks
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Does SSD capacity affect battery life on laptops?

I have read in threads like this that SSDs are more power efficient than HDDs. However, I'm wondering if for instance if a 500GB SSD would be more or less power efficient than a 2TB SSD for standard ...
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Why did the majority of options of Advanced Power Options disappear?

I've recently noticed that the majority of options have disappeared from the Advanced Power Options menu. For example, this is what it should look like: However, this is what it looks like instead: ...
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Two power supplies meter the same, computer turns on with one but not the other

I'm trying to diagnose an apparently random sudden power-off problem on a desktop, so I swapped out components until the power supply and mother board were the remaining suspects. I removed power ...
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78 views

Parallel battery charging UPS

Just bought new ips for 25 dollars and have bought 3 batteries 12v 9ah each. What i did is the following Opened the UPS and connected positive end of the battry to a wire that is connected to a ...
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Mini PC stick can be powered with wall outlet (5V/2A) but not with power bank (also 5V/2A)?

I bought this product with the hopes of powering it with a power bank: https://www.intel.ca/content/www/ca/en/products/boards-kits/compute-stick/stk1a32sc.html https://www.amazon.ca/gp/product/...
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Disabling CPU Turbo Boost causes unexpected increase in GPU power usage?

When I disable the CPU Turbo Boost the following happens: the CPU clock and power correctly decrease the GPU power consumption and temperature increase - despite 0% GPU load and no change in GPU ...
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How to use all the 45 Watt out of the Xiaomi Mi Power Bank Pro 3

I have been working on this project that consists on making a somewhat portable computer... I intend on using a Raspberry Pi and an old laptop monitor to get the job done. The thing is that I bought a ...
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Windows 10 server appears hung/asleep until user RDCs into the server

Background I have ten Windows 10 servers which are used to run regression scripts 24/7. There is another machine which has a controller software which sends scripts to be executed to the 10 servers. ...
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Windows 10 Hybernation mode does not Work

My Windows 10 version 1909 and build 18363.778 does not properly hibernate. On clicking the hibernation button screen turns off but the computer doesn't. If I press any button on keyboard or move the ...
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USB Pass-through Overriding BIOS ERP Setting

I recently purchased the Corsair Wireless Charging Mouse Pad and the USB pass-through on it is causing an unintended side effect. I have ERP enabled in my BIOS to shut USB ports off when the ...
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Macbook Pro (2016? with touchbar) won't turn on. Caps lock light works. Sometimes “esc” key will light up on touch bar

I can't figure out how to fix my computer. It just stopped working earlier. I tried resetting the NVRAM by holding P+R+⌘+ ⌥ while turning it on but it didn't work. The screen is all black and so is ...
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Is it safe to leave an external HDD plugged into USB but unplugged from power outlet?

I have an external USB 3.0 HDD that I only use for weekly backups. I usually just leave the usb cable connected to the computer and plug it into the power socket when needed, do the backup, then eject ...
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77 views

Tingling/shock when holding USB plug of externally-powered device (speakers, etc) and touching HDMI/DP plug

PC: GPU: Gigabyte RTX 2070 Windforce CPU: i7 7700 RAM: Kingston HyperX Fury 16GB DDR4 Mobo: GIGABYTE GA-B250-FINTECH PSU: EVGA 750 G2 Case: Coolermaster HAF 912 Combat I'm troubleshooting an ...
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30 views

Computer won't shut down properly with USB device plugged in

I'm running Windows 10 and recently bought an Audioquest DragonFly Red USB DAC - ever since, the device is of course plugged in constantly so that I don't need to reconnect it each time I start the ...
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35 views

Does unplugged computer drain power from connected mobile phone?

When I unplugged my computer from mains it continuously drain power from connected mobile phones. I've also tried different usb ports but nothing change all ports are draining power from mobile ...
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What tools and kernel features some desktop environments use, to monitor battery level

I have noticed some strange behavior of battery charge indicator in Gnome and Cinnamon. When you plug charger into laptop, it updates battery charging status(charging/discharging) only when battery ...
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zenbook ux31a fails to boot very often

I press the power key: the power key led lights up then the caps lock key led lights up caps lock key light goes off power key light goes off There is no screen response at all. I have pressed the ...
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37 views

Determine what's eating CPU

I'm trying to determine which processes/threads are spiking up CPU usage. The scenario is the following: I'm playing games on my XPS 9560 (suffers from power limit throttling). I've made a mod that ...
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59 views

Test Wake-On-LAN without actually doing it?

I have a bizarre request. I seriously need to verify whether or not a PC is able to be powered on via WOL, meaning that the BIOS and power settings on the PC are set up correctly and it would boot up ...
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299 views

why do 2.5“ ssd's use more power than 2.5” hdd's?

I have a bunch of 2.5" HDDs. Their power requirements vary but it's usually in the range of 5V 0.6A - 0.85A (so 3 to 4.25 watts). RPM speed doesn't seem to play a huge factor nor does physical size, ...
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Some USB devices not working properly on a new W10 x64 machine

Can you help me with a problem that I have with some USB devices not working properly on a new built machine. I hope you will be able to help me, being myself a power user, but here a little lost in ...
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How to add power to usb 2.0 cable, and don't lost transfer. What to buy

I have a USB 2.0 signal cable without power. (connects the piano with the tablet). These are my ports / terminals: male, USB 2.0, type A (end of piano midi cable, without power, only signal) female, ...
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73 views

Laptop not charging consistently on Windows but does on Ubuntu

Setup: I have a Lenovo T440s running Windows 10 which requests 20V and 2.25A/3.25A and a charger providing 20V and 2.25A. I have been having this problem for a while. Essentially, when I plug in the ...
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40 views

My Dell Latitude running Ubuntu 18 “sighs” when the lid is closed

I have a Dell Latitude 5401 running Ubuntu 18.04, using i3wm desktop environment. Ever since I've started using Ubuntu (about 6 months ago), each time I close the lid, I will hear my computer's fan "...
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49 views

Samsung 860 QVO SSD power management

I was in the process of installing a pair of 860 QVO SSD's into a computer being setup as a server. I grabbed leads for power from the cupboard and plugged everything in. System wouldn't boot. After ...
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17 views

External PSU for gpu?

I found an EVGA GeForce 750 ti graphics card and wanted to pop it into a lower-spec machine. However, the PSU is not up to the task. Is there a way to power just the GPU over the PCIe slot? the card ...
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24 views

Computer turning on and off immediately after CPU chassis was shaken

I was try to move something and it bumped against the CPU chassis, it froze, so I pressed the reset button, since then, the computer is turning on and off immediately, it continuously cycles on-off. I ...
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115 views

How can I change the text of my low and critical battery notifications on my Windows 10 laptop?

Windows 10 laptops' low and critical battery notifications are not as "forceful" (?) as how it was in previous versions. This is just plain weird because Windows is alerting you to take action, but ...
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Is there an hdmi + data / power to usb-c cable?

Trying to replace a bad quality proprietary cable. I have tried searching amazon / google. All I find are usb-c to hdmi. I don’t think they will work “backwards”. I have a touchscreen that gets its ...
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My PCIe WiFi 6 card only works after I cut the power to the PC for ~> 20 seconds. What could be wrong?

On my desktop PC I have an issue where my Wifi PCIe card is not recognized at all when I boot the computer in the morning, after it was shut down the night before. It's a dual boot system and it's the ...
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1answer
71 views

How to repair hardware having dificulties to turn ON PC

I have a very strange problem that gives me troubles almost every time I try to turn on mi PC. Yes, almost, not always. When I push the power button, my computer acts like nothing happened. Sometimes ...
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32 views

Leaving computer monitor on (not standby) and lit overnight

How bad is it to leave an LED monitor lit and on overnight? It will not be in standby mode. The time frame is 6-12 hours of “on”-time, but this could be variable. To avoid burn in, the brightness ...
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64 views

Computer shuts down instead of going to sleep

I have a windows 10 computer, and whenever I press the power button, even though it is set to sleep, shuts down the computer anyway. It does this when I select sleep from the start menu as well. In ...
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37 views

High performance and power saver power plans are optionally listed

I have a problem with power plans in Windows 10 (1809). When High performance is active, 2 power plans are listed with powercfg /l: Power Scheme GUID: 2431d4e2-bce2-440c-be16-470ab24cd64b (...
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30 views

Windows computer restarts several times after power on

The PC runs normally Windows 10 system for years till last week. Now every time I turn the power on, it will reboot after about 3 secs and repeat this for 3~5 times before it finally boots into the ...
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1answer
119 views

Windows 10 Notification: PC isn't charging via USB-C, even though Power Supply is connected

I have recently bought a Lenovo P53. Since I needed docking station and thought that the Thunderbold3 dock was to OP for me, I bought the smaller USB-C dock. I know that you can't power the P53 (...
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1answer
30 views

Laptop crashes while booting if battery is removed

I have an old laptop that i decided to use as a media center for my TV. Since it would be used for long periods of time, with the power plugged in, it would damage the battery, so I removed the ...
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35 views

Windows 8 - Missing 'Balanced' Power Plan

I've seen a similar (although not the same) question here Default Power Plan options apart from Balanced have disappeared, how to restore them? but I did not understand what to do. Basically, when I ...
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1answer
119 views

Apple Cinema Display - Doesn't work if USB plugged in

Product Apple 30" Cinema display ('05) Scenario For my macbook pro laptop this monitor requires a mini display port + usb connection to provide full resolution of 2560x1600. However with my desktop ...
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1answer
209 views

Is it always necessary to connect SATA (or MOLEX) power to PCIe-USB-3.0 adapter cards?

I would like to put a PCIe-USB-3.0 adapter card into one of my PCs. I have noticed that nearly all of such adapter cards have a power connector (either MOLEX or SATA). I would like to know if I can ...

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