system doesn't boot

[Matt1eD]

If you don't hve the mobo instructions then they're probably available on the net.

[LeeumH]

what u could try is remove the battery on the motherboard for a few mins to clear the cmos, put the battery back then try powering it on, could be that it decided not to post when the previous owner was tweaking it and decided to send it out as it was

this would mean the bios is back to stock settings though so the overclock would be gone but shouldnt be hard to get back

Yip, reset the CMOS, that should do it tbh

[Ramedge]

maybe its the motherboard - could be a dodgy build by the sounds of it ( thats based on what i have read ) i had a similar problem and i was advised to check all the connectors blah blah blah ... and it was basically the motherboard, somthing was touching the case when it booted it caused the mosfets (which are transistors on the motherboard) to short out and blow. Who/Where did you buy it from?
It may not be that but its starting to look that way

If its an ASUS mobo make sure the Green Light is on

[Matt1eD]

eBay

[SteveRoads]

The green light was up ... put in an old PCI gfx card, still wouldn't work ... tried yet another monitor, no luck.

Sent it back, chapter closed, thanks a lot for your advice, it was really appreciated.