Computer power working, but won't boot

[Hampton]

So have you tryed removing the ram and Video? these can prevent booting if they are defective.

 

[ltjimmy]

Yep, both. Results don't seem to change.

 

[Hefemeister]

no beeps from the motherboard when the ram is not installed? Do you have a motherboard speaker?

If it is working it should go crazy on you.

 

[ltjimmy]

No beeps from the motherboard. Is there a way to toggle it on and off?

 

[Hefemeister]

nope you either have a speaker or do not.

 

[adaeon]

My dad had this problem and I advised him to flip the switch on the back of the power supply off for about 10 seconds then back on. His computer booted again just fine but some do not. Try that and if all else fails, get a new PSU.

 

[ltjimmy]

Already swapped the PSU (see a few posts back). Didn't seem to help anything; I'm pretty sure it must be the motherboard although I'd really like to know what caused it to fail, it's only about a year old.

 

[Hefemeister]

pull it from the case and try to run it in case it got grounded some how. Check it for burned out capacitors.

 

[ltjimmy]

So I've pulled the motherboard from the case and still same problem. Fans seem to work and the green light goes on (the motherboard) when I swith on the I/O switch at back of psu. No burned capacitors or visible signs of wear that I can see. Still a mystery...it's an Asus PB5 ATX775, can't find any info on whether or not this particular MB has an internal speaker and there's no mention of it in the manual. It's dead silent when I fire it up with no RAM so maybe that's a telling sign

 

[Hefemeister]

I do not see a speaker on your board but t does have connectors for one of the front panel connectors.

http://dlcdnet.asus.com/pub/ASUS/mb/socket775/P5B/e2620_p5b.pdf page 56

If you case has one you can connect it. If not you can get one for a couple of dollars.