Sign in with
Sign up | Sign in
Your question
Solved

Plugged USB Devices Make PC Cannot Turn On

Last response: in Components
Share
August 23, 2013 1:12:02 AM

First of all, sorry if there are any Engrish. And sorry for the quite long post because I tried to explain my problem as clear as possible.

To avoid TLDR, this is my question: can USB devices cause problems with the computer power, specifically the CPU fan?

I have an about-one-year-old PC built from a modified tomshardware's December 2012 $500 Gaming PC: (Pentium G860, ASRock H77M, Corsair 2x4 GB, GeForce GTX 560, 500 GB SATA3 Harddisk, Samsung DVD Writer, Corsair VS450 PSU). It works very well for me (although it can't play newer games at maximum setting, perhaps because of the G860).

After a year, things get dusty. So, I opened the case, plugged off all cables, cleaned the dust, and plugged everything backward again. The PC works well, but suddenly it turned off by itself when I was working. I turned it on again, but nothing shows up on the monitor. I opened up the casing again and checked if there are any mistakes in plugging cable. There wasn't. I noticed that when I turned on the PC, the CPU fan wasn't turned on, and the PC will turned off by itself after several minutes.

I tried to reset the CMOS BIOS using the jumper, and the PC turned on again (the CPU fan also turned on). However, it suddenly turned off again by itself when I tried to login at Windows 7. The problem appears again (CPU fan wasn't turned on).

I tried to boot up the PC using minimum devices (with harddisk, keyboard, mouse, and monitor). The PC turned on and everything worked well. I plugged on the DVD drive and still no problems. I tried Bioshock Infinite benchmark to stress the PC, still no problems. The PC had running without problems for over a day now.

At this point, I suspect that the problem lies in USB devices I used. I used these USB devices: a 4-USB hub, printer, scanner, USB keyboard, USB mouse, a gamepad, and a USB cable (to plug in USB keys). I haven't tried plugging each of them again, but I'll try meddling with them as soon as possible (I'm currently traveling away from my PC).

This is my question: can USB devices cause problems with the computer power, specifically the CPU fan?

Thanks in advance.
August 23, 2013 1:19:50 AM

They can, do you have a good power supply which has a high enough wattage(at least 30% more than needed)? And plug them in, one by one when your back at your pc.

Best solution

a b V Motherboard
August 23, 2013 1:31:24 AM
Share

They sure can. Just recently got that problem with an internal, active USB hub.
Maybe try to plug everything in except for the hub and the cable?
Related resources
August 23, 2013 1:34:42 AM

If it was working before, wirth the same amount of devices, I would check again very thoroughly all connections inside the case.

I once had a similar problem, with a PC that wouldn'd even turn on properly. I had just reassembled it, after changing the PSU and I thought i had burned something... Turns out, it was the DVD drive not properly seated in the case, causing a problem with the case's grounding. I just took everything out, re-assembled it again and everything was OK.
August 23, 2013 1:53:00 AM

heyitsmelol said:
They can, do you have a good power supply which has a high enough wattage(at least 30% more than needed)? And plug them in, one by one when your back at your pc.


About the power supply, the Corsair VS450 supplies 450 watt. I don't know well though, is it enough for Sandy Bridge + GTX 560 + SATA3 HDD + DVD writer?
August 24, 2013 7:14:27 AM

Turns out that the culprit is my USB hub. I connected the hub and the PC went off after about 30 minutes. I am still amazed, though, that a USB hub can cause problems with the computer. Thanks everybody!
!