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

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4
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2answers
18 views

Does an INTERNAL USB hub affect performance?

I searched a little bit on the subject, but I couldn't find any clear answers, so I'm asking this question: Will the performance of a USB hub connected directly to the motherboard be shared between ...
0
votes
0answers
15 views

Power supply needed? can I use the same size because old one is near end of life or do I need a larger one

Symptoms, my computer when it gets going the power will just cut, the power indicator stays lit but everything else dies, all the fans, the screens go dead it does not respond on the network (ssh ...
0
votes
0answers
7 views

How to reduce number of wakeups/seconds due to timers?

I'm trying to reduce power consumption on one of my server. The machine is idle a lot of the time. I have monitored the number of wakeups/seconds with powertop and I see something strange: Summary: ...
2
votes
2answers
34 views

Is it not unsafe for a laptop to hibernate/suspend while an SD card is mounted?

I have been witnessing for years my Dell laptop freezes as it resumes from hibernating while an SD card is inserted in the slot and mounted. It of course took me some time to figure that out, but I ...
0
votes
1answer
40 views

How to know how much electric power a laptop is consuming?

On a laptop charger adapter it is written '65 Watt'. When I am using that laptop plugged into an AC socket, does it mean that it consumes 65 watt per second? I think it actually depends on usage. ...
1
vote
2answers
51 views

How many HDD's off 1 Molex? PICOPSU

First question here. I saw some posts about powering 2 HDD's from one molex, but I want to power 3-4 drives. I want to use a single molex and use splitters for the rest of the drives. Below is an ...
0
votes
1answer
32 views

ALFA AWUS036NH TX power vs USB current usage

I have ALFA AWUS036NH network adapter on raspberry pi model 2B running the latest raspbian. ALFA AWUS036NH should be capable of delivering up to 2W of power according to specs. Following some ...
0
votes
0answers
37 views

Battery does not resume charging after power interruption, if brand new HP Envy notebook is powered off

I got this laptop just yesterday, and I have a weird problem. Configuration of laptop: CPU: Intel Core i7 5500U @ 2.4GHz (Turbo 3.0 GHz). CPU: Nvidia GeForce GTX 850M (4GB dedicated). RAM: 8GB ...
1
vote
1answer
14 views

wireless router power adapter replacement 0.5a vs 0.6a

i have a wireless router with no power adapter, it needs a 9 volts 0.6 amperes adapter but i only have 9 volts 0.5 amperes power adapter. Will 9 volts 0.5 amperes power adapter damage my wireless ...
0
votes
0answers
17 views

ASUS monitor turns off, replacing the power cord works for a while then it happens again

My ASUS monitor is turning off a couple of times a day and is unable to be turned back on. I discovered that replacing the power cord allows it to turn on again, and in fact if I just plug in another ...
0
votes
0answers
11 views

Power plan switching brokes

I have ASUS U36S notebook and sometimes everything works fine. But sometimes power plan switching stop working. So for example CPU speed fixes on 34% of normal and I can't change it. This can be ...
1
vote
2answers
22 views

Acer Aspire V7 - Power Button and Lid Closed

I want to use my laptop with the lid closed with external screen, keyboard and mouse. I would like to turn on or take out of sleep/hibernation but the machine not allow this as long as the lid is ...
1
vote
2answers
45 views

How well is computer hardware protected from sudden power loss? [closed]

I always wondered how well the computer components can handle sudden power outages due to janitor accidentally pulling the power cord, whole city block power outage or power generator failure. Are ...
2
votes
1answer
40 views

How to put Windows Server into something like “Standby mode” so I can safely pull the plug off of it?

I have an interesting problem - we are going to test our UPS backup system by pulling the plug in our server room for a short time. Ideally the UPS will kick in and nothing interesting will happen, ...
-1
votes
1answer
42 views

should I remove an old laptop battery to save energy?

Does the old battery of an old laptop use a lot of energy when the laptop is connected to AC? Does the power supply waste electricity trying to continually charge an old battery? If I remove the ...
-1
votes
3answers
42 views

Is it ok if I charge my IPad with the power adapter that I use for my Samsung Tablet?

My iPad version details are as follows: Model A1460 Complies with the Canadian ICES-003 Class B specifications FCC ID: BCGA1460 and IC: 579C-A1460 Serial: DMPKF3F4F18Y There is something wrong ...
0
votes
1answer
30 views

Windows Power Options - Turn off the display - HDMI not saving energy

I recently purchased a BenQ GL2760H Monitor which has both HDMI/VGA/DVI inputs. I have a Dell Desktop with Window 7 which has a built-in Intel graphics card with just HDMI and VGA outputs. I also ...
0
votes
1answer
36 views

How transmit power affects power consumption of Wi-Fi router?

I wonder how Transmit Power affects power consumption and heating of my home wireless router. Below you can see a screenshot from router control panel. I can easily set it to 50% and on Windows 8 ...
1
vote
1answer
26 views

How to format the size of multiple link images in a power point simultaneous (2007)?

I've a powerpoint with one link image on each slide. I must update these images regularly but when I do, the size format of each link image changes. Can someone tell me, without using a macro, a ...
-1
votes
1answer
62 views

USB flash drive disconnecting and reconnecting continuously [closed]

I have almost the exact same issue as described here with my flash drive, but on Windows 7. My flash drive disconnects and reconnects continuously every few seconds, on the USB 2.0 ports, BUT on my ...
0
votes
1answer
38 views

Can I Swap Out Dell Desktop Power Cable

I accidentally stepped on my desktop power cable on my Dell XPS desktop. The warning on the insert (not the manual) said to replace it if damaged. Can I use the power cable from my old desktop ...
0
votes
1answer
31 views

Intel Broadwell Power Consumption and Clock Speed

I'm configuring a new MacBook Pro 15″ 2015 and wanted to know if the processor speed affects the battery life (power consumption) assuming that the work load is identical? 2.5GHz Quad-core Intel Core ...
0
votes
1answer
44 views

Lenovo Yoga Unable to Power On

So I was watching some YouTube videos earlier and my computer suddenly shut off, similarly to what you would expect if it had overheated. I don't expect that it did overheat: I wasn't actively ...
3
votes
1answer
33 views

Will a 800va UPS output 800va after 3 years of usage?

I have been using an apolo 800va UPS for three years for my desktop. During a power outage will the UPS supply 800va to my PC? When a UPS ages it will decrease the battery backup time but will the ...
0
votes
1answer
20 views

Finding Power Supply for laptop [duplicate]

I have a HP laptop that came with an 18.5V power supply. Is this power supply unique to the point I have to go back to HP to get one or can I get one from say Radio Shack?
2
votes
1answer
82 views

can i connect my usb powered speakers to my phone charger? [duplicate]

I have got a 2.0 USB powered speakers which are supposed to be connected to the PC USB port. But that port creates noise in the speakers and is not very convenient. I have a phone charger of output dc ...
10
votes
2answers
536 views

What happens when laptops reach 100% charge?

I have been reading alot of mixed views on how Lithium Ion batteries work when it comes to laptops. I have the new dell xps 15, with an intel i7 cpu, 16gb ram, and a 512gb ssd. Is it bad for the ...
0
votes
1answer
17 views

Automatic power on my server

I have a problem with electricity in my company (common cuts) how can I make my server (DELL POWEREDGE 2900) starts automatically when the electricity is restored and I'm not there
0
votes
1answer
39 views

Laptop goes to sleep when lid is closed and disconnected from power

I am trying to work with my computer (Macbook Pro) attached to an external monitor, while the lid is closed. I can work on it when the laptop is connected to power, but when I disconnect it from the ...
0
votes
1answer
35 views

PC powers down randomly

My PC powers down and freezes randomly when on windows 7. It works fine on linux. I tried to run memtest and it powered down during(at about 12 %, 0 errors reported till then). On linux mint it runs ...
3
votes
2answers
66 views

PC only turns on when it wants to

I think my PC is possessed; it only turns on when it wants to. ...Jokes aside, my PC is not turning on and the symptoms are very strange and, to some extent, apparently random. I need help ...
0
votes
0answers
16 views

Asus Vivo Mouse - Touch Pad Not Reacting After a Few Seconds

I'm having an Asus Vivo Mouse which combines a regular mouse with a touch pad. Anyway, everything works just fine. But when I position the mouse steady and only use the touchpad, it sometimes just ...
1
vote
0answers
15 views

HP Mini won't work with battery alone without an AC power

What to do with HP Mini netbook that doesn't work without AC adapter? Even if the battery is attached and with 80%-up power charged. I consider that maybe need replacement and I did with the working ...
-1
votes
1answer
29 views

Can i W PSU on 0660W UPSrun 60 [closed]

Is 600 watt Power supply takes more input voltage than 350 watt power supply?.
0
votes
2answers
76 views

Is it fine to run a dc motor through USB cable connected to my laptop?

I have a dc motor which needs more than 10V to run efficiently, so instead of running it on electric cells, I usually run it using my laptop's power. I connect a USB cable to my laptop and the other ...
0
votes
2answers
55 views

Computer not booting up after reconnecting to electricity

Recently I started having problems with a bit older PC (quadcore with 4gigs of ram). When I disconnect it from electricity for few minutes/hours for example when I want to clean it from dust or move ...
0
votes
1answer
64 views

PC doesn't turn on on first try on the power button

Every morning when I try to turn on my computer, it doesn't boot. It will only boot after several tries on pushing the power button. The PSU is alright as it powers the other fans immediately. When ...
0
votes
1answer
43 views

Can the USB ports on a Lenovo Yoga 3 laptop stay powered when Ubuntu 15.04 suspends?

I can't find a BIOS setting to keep the USB ports powered on suspend. Wondering if Ubuntu can keep them alive? I just want them powered so some devices (phone) attached to the ports can carry on ...
0
votes
1answer
23 views

Identify last linux shutdown time

We have a server running RHEL 5. Sometimes the power cuts and the server is down (the UPS handles only 30 min). I want to be able to to identify the time of the shutdown, in an other term the last ...
0
votes
0answers
30 views

Diagnosing hardware issue/Laptop won't boot

My (discontinued) HP Pavillion Notebook won't turn on. I encountered this issue RIGHT after the cord connecting my ac adapter to the wall outlet was unplugged (not the plug in the wall, but the ...
23
votes
4answers
2k views

When do I need a pure sine wave UPS?

I would like to buy a rack UPS that would support all the IT related electronics in a SOHO room. This include switches, routers, PCs, servers, NAS. During my research I found out that there are ...
0
votes
0answers
31 views

Connecting an LCD display to msp430 launchpad?

So im trying to give my lcd display (Lumex 1602) 5v. Im trying to use the test pins on my msp430 launchpad TP1 and TP3. On the LCD pin 1 is gnd and pin 2 is power. for the launchpad TP1 is power and ...
0
votes
0answers
19 views

PowerVault Model CSEH 001

What does it mean when the exclamation Mark is on and it displays the number 6? Any help? I tried to search on google for an answer but I cant find anything that actually helps me.
0
votes
3answers
85 views

Will my hard drives be harmed if I hold down the power button for 5 seconds? [duplicate]

Sometimes I face the problems with my video card, so the system freezes. Reset button is broken, so the only way is to hold down power button for 5 secs. Guess that this action differs from power ...
0
votes
0answers
26 views

Allowing computer to turn off USB hub to save power - how much power?

Should the computer be allowed to turn off the usb hub? I have seen a solution suggested for slow USB recognition - to prevent the computer from turning off the usb hub. But there's a reason for it ...
1
vote
2answers
60 views

Computer Randomly Powers Off. What's The Cause?

I upgraded my computer a month or two ago now and now every so often, my computer will randomly shutdown (and then restart after about 5 seconds). To clarify, it usually shuts down when coming out of ...
0
votes
1answer
22 views

StoreJet 25M3 USB 3.0 1TB beeping?

So my storejet started beeping just now, the beeps only occur when I supply power via the a USB port, and the beeping only lasts for about 5 seconds and after that the beeping is gone and it just sits ...
2
votes
1answer
55 views

Coffee-damage via USB?

EDIT - Turns out coffee got into the case through the top fan... dripped down the back of the motherboard... Ho hum.... This morning my cat decided to chase absolutely nothing across my desk. This ...
0
votes
1answer
55 views

PC restarts on power outtage despite having a UPS

Unfortunately where I live I do not have 24/7 electricity. My new PC rig which is considered to be a high-end(gaming) system is connected to a brand new APS/UPS that have these specs: DC-AC ...
1
vote
1answer
24 views

Windows 8.1: Keep remote monitors/displays off during RDP

In the mornings, I leave my user account logged into my Windows 8.1 Pro desktop. My monitors power off a few minutes before I leave my home. Later, I RDP to that PC using the same username.. which ...