Having Trouble Starting up my Homebuilt Computer

[Will89]

I have currently built my first computer with the help of another person who knows what he is doing.

After we assembled everything we switched on the power supply and the LED on the motherboard lit up like it was supposed to.

When we press the power button on the case, the CPU fan, two case fans, PSU fan, and case fan's LEDs all start spinning and lighting up for half a second and then stoped. The Motherboard LED was still on.

We press the startup button on the case again and nothing happened.

It is only when we turned the power supply off then on and then pressed the startup button that this momentary flicker occured again.

I had somebody else who has considerable knowledge in this field help me reconnect all the PSU wires and the same thing happened.

The components I am using are:

PSU: OCZ GameXStream 700 Watt ATX
MB:Asus M2N32-SLI Deluxe
CPU:AMD 64 X2 5200+
VC: Biostar GeForce 7900GS 256MB
RAM: Corsair XMS2 2GB

Has anybody had this problem before and can offer me advice?

Anybody know what the main problem is?

Thanks

 

[mechBgon]

You may have a short-circuit there. Try this:

1) remove the motherboard assembly from the case, and lay it on cardboard outside the case

2) attach ONLY the devices that are required for the motherboard to display the POST screen. That means just the CPU & heatsink/fan, one stick of RAM in slot DIMM_B1, video card. No keyboard, no mouse, no drives, no extra cards or devices.

3) ensure that your ATX12V cable is connected to the motherboard's separate ATX12V receptacle (ATX12V is two yellow wires & two black wires and goes in a separate fitting). labelled pics of the cables here :camera:


On this motherboard, one possible source of a short circuit would be if you installed a motherboard standoff in the location circled in this pic :camera:, since your motherboard doesn't have a bolt hole there.

Another possible source of a short circuit would be if the EMI springs on the rear I/O shield got into the network jacks, USB or Firewire jacks.

A third source of short circuits would be if you got the ATX12V cable mixed up with the 4-pin section of the 24-pin ATX cable. They're different voltages, so you don't want to get them mixed up.

Any good?

 

[vanvock]

I had an Enermax PSU do the same thing, if mech's steps don't find the prob try another one.

Welcome to the forums, btw.

 

[Fallen Kell]

After trying what mechBgon said, you can also try looking in the manual for your motherboard and go to the troubleshooting section. There is usually a list of symptoms with their common problem listed.