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*solved* New system won't stay on

N

Nibelheim

Junior Member
I am building a new system (first time trying this), and when I turn the power on the fans will come on for just a second and then go off again. I have tried turning on the system with the motherboard both in and out of the case. When I had the motherboard in the case I did use standoff screws. The power cables are plugged in the right direction. When I plug in the power supply, the LED on the motherboard comes on. The only part I am using that is not brand-new is the power supply. It is an Enermax 350W that one of my coworkers gave me.

Right now, I have removed everything from the case. The only parts I am using are:

motherboard (out of the case, laying on the electrostatic bag it came in)
CPU/heatsink/fan
1 stick of RAM
power supply

The only cables connected to the motherboard are:
20 pin ATX power
4 pin ATX12V power
CPU fan
PSU fan
ATX power switch from the case

Any ideas on what else to try or something I forgot to do?

Thanks in advance.
 
Originally posted by: montag451
have you got another system, or bits you can swap around?

I would probably try the psu first.
Click to expand...

No other power supplies here with an ATX12V connector. My coworker has 2 other extra PSUs that I can get on Monday.
 
Originally posted by: montag451
meanwhile, anything else you have lying around - cpu/mobo/ram
Click to expand...
Nope, the new stuff is for a AMD 64 bit system, and this computer is an Athlon XP. I could reuse some RAM from this computer but I don't think it would make a difference, since I can't keep the power on even with no RAM sticks installed.
 
Take out the CPU and heatsink and leave the heatsink plugged in. If the computer fan stays on that means you have damaged the CPU (probably by putting on the heatsink the wrong way). I should know it happened to me 🙁
 
One of your other devices may have a short in them. I took this old hard drive out of an old Dell to test on my computer, and it did the same thing. Turns out the HDD had a short in it. Just a thought.
 
It was a bad PSU; got a new PSU from my coworker today, and now the fans stay on!

Thanks everyone for your help and suggestions.
 
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