2
votes
1answer
60 views

Computer is OFF, and fans turn on and off twice a day

We have an OptiPlex 755 desktop acting quite strangely here. It's powered off, not in standby or hibernate, and from time to time it will just start spinning its fans for a few seconds, and then turn ...
0
votes
0answers
33 views

Front fan controller power

I've just built a new PC with 11 fans. I've bought a very cheap Chinese fan controller with 4 channels, and I connected my 11 fans to each other in groups of 3 + 3 + 3 + 2, and each group to one ...
1
vote
1answer
8k views

Do I need to replace my CPU or Motherboard, PC not powering on

My PC will not power up at all, after thinking it was the PSU I replaced that to no resolve. When I try to power on the PC the CPU fan will move about 1mm and then nothing. I tried all sorts, but it ...
5
votes
1answer
487 views

How fast will a fan run on Molex? [duplicate]

Possible Duplicate: Buying A Computer “Case” Fan… Does It Always Run At 100% Unless Told Otherwise? I don't have quite enough 3 pin fan slots on my Motherboard so I'll need to run at least ...
1
vote
3answers
4k views

PSU failing or Mainboard failing?

I am having some troubles lately powering on my desktop workstation. While starting up the PC after being off for hours (usually at least 8 hours) it randomly fails to do so. What happens is that : ...
2
votes
3answers
393 views

Would this short circuit?

My computer case has a built in fan which uses a Molex 8981 connection for power, but before reaching the fan, the wires split to form another male molex connector. My problem is that if I was to ...
15
votes
4answers
1k views

Buying A Computer “Case” Fan… Does It Always Run At 100% Unless Told Otherwise?

What happens if I do not plug it into the motherboard and it does not have a switch? I have seen fans before with an "off/low/high" switch that allows you to manually set their speed. I have seen ...
5
votes
1answer
118 views

Need to find a power adapter

Just finished upgrading the heatsink and fan in my wife's computer (dropped the temperature about 20 degrees on an AMD), and everything works great except one problem. The BIOS is reporting that it ...
3
votes
2answers
1k views

Powering-down USB Powered Devices on laptop sleep

I recently purchased a Targus Lap Chill Mat, which is a USB powered device, but doesn't have any interface/storage/etc function. I'd like it to power-down when my (macbook) laptop sleeps (since the ...