Why doesn't my system turn on?

[Cannibal Corpse]

OK,

Built this system:


ATi RADEON HD 3450 PCI-E
Intel Dual Core E5200 (2.5GHz)
Intel DG45ID MoBo
2GB 800 DDR2
400W PSU
Vista 32 Ultimate


about a week ago. Been running just fine, with no issue. all of sudden, it shut itself down. I pressed the power button, and only for just a second, the CPU fan runs then it powers down.

I was 110% it is the PSU, so I swapped with another brand new one (this one is ANTEC 500W). and it does the same thing.

I thought it might be the power switch (although) it does seem to work, since the CPU fan could not spin. so I used a small, delicate watch screw driver tip to 'short' the power switch jumpers. It still does the same thing, spins the CPU fan for a second then it won't turn on.

I have removed the 2 sticks of RAM, video card, front panel USB connectors (used by my Case). The only thing left is the CPU.

My motherboard has a small led (called pwer_led) that turns on (green) when the PSU either of the PSUs are connected, so I don't think the mobo is dead.

Is the CPU or Mobo DEAD?

Thanks for your help. I am going crazy over this one!

 

[Dangman]

Are any other fans connected? If so, do they also spin up and shut down like the mobo?

Oh and did you make sure to use another set of GPU and RAM with that system? You said remove so not sure if you used replacement parts.

Also WHAT 400W PSU do you have? Which Antec 500W PSU are you talking about?

 

[Cannibal Corpse]

The 400W PSU is a generic one. I removed all the parts (with no substitutions) to make sure they are not any variables. The green led on the intel mobo is ON though. I am baffled.

 

[Dangman]

I removed all the parts (with no substitutions) to make sure they are not any variables.

Umm, you need GPU and RAM for the systemt to POST successfully.

That generic PSU may have killed your mobo. Only way to know is to get another mobo and test your CPU with that.

 

[Cannibal Corpse]

Are any other fans connected? If so, do they also spin up and shut down like the mobo?

Yes, they indeed spin and then stop.

I forgot to mention that I don't hear peeps coming out from mobo. Also took the CMOS battery out for about 15 minutes and put it back on...same thing: the CPU and Case Fan starts to spin, then nothing happens. It seems as if it has not enough juice to power up the system. Even with the 2nd PSU (500W Antec). What gives?

 

[Dangman]

Well like I said earlier, defective mobo brought upon the generic PSU. It would still occur with the Antec 500W. The damage was done by that generic PSU.