PC Troubles - Won't boot

[milomak]

Just put together a new PC.

The green LED light on the motherboard is on. However when I press the power button the chassis and heatsink fans start to spin (for less than a second) and then nothing. The green LED on the motherboard however remains on.

I have swapped PSUs (new one a Gigabyte Odin 370kW and old one 350kW). Same thing happens. I can't believe that the components are overbearing the PSU:

M4N78 Pro motherboard
2GB RAM
Athlon X4 965
2x80GB HDD

Any ideas?

 

[KhoisanX]

I have swapped PSUs (new one a Gigabyte Odin 370kW and old one 350kW).

Those are some mighty PSUs.
Any beeps when you power up?

 

[ponder]

Any post codes/beeps?

You most likely connect something incorrectly.

 

[Ratwiz]

Which BIOS is currently on that motherboard? You may need to update the BIOS in order for that board to support the Phenom 965 (supported only from BIOS 1004 according to ASUS: http://www.asus.com/product.aspx?P_ID=lco8LZWTqWIhdLmv )

 

[Rodent-Boy]

If there's no PC beeps, remove the RAM completely and try to boot and see if you get any beeps then. If so, swap RAM. You could try removing the entire rig out of the chassis to make sure you haven't shorted something.

 

[HavocXphere]

Short somewhere imo. Rebuild outside of case on wood desk.

 

[Park@82]

... 370kW and old one 350kW...).

Are you sure that is not W instead of kW (i didn't know they make them that big )? If its Watt you might be a bit low on power. Are you using on-board graphics?

 

[medicnick83]

1. Take the PC outta the case, and put it on a desk.
2. Using minimal stuff, start the PC up using only memory and the bare basics EG: screen plugged in with keyboard
3. If it works, start plugging in other stuff, like hard drive and trying and see what happens and let us know

 

[RSkeens]

I agree, rebuild top to bottom - including reseating the heatsink. That sounds like a short or emergency core temperature shutdown.

 

[Drake2007]

Did you remember to plug the 4 pin molex that supplies the CPU in?

 

[milomak]

foolish me. in my haste i had forgotten to put the things on which to mount the mobo to the case.

 

[Drake2007]

You forgot the stand-offs?

 

[Rodent-Boy]

foolish me. in my haste i had forgotten to put the things on which to mount the mobo to the case.

Lol, ouch!

 

[Drake2007]

any updates?

 

[PsyWulf]

I smell something...

 

[Voicy]

Short somewhere imo. Rebuild outside of case on wood desk.

I found the same cause when helping a mate with his pc. He connected everything 100%.......but forgot to put spacers on his board, so it was screwed directly onto the case with the entire motherboard shorting out below.

It's such an obvious thing, but completely overlooked.

 

[milomak]

and i remember thinking to myself that the mobo seemed to be screwing in funnily.