Boot problems

[Jaridan]

My system has recently started having problems when turing it on.
At first this was intermittent and only happened maybe 3 times in the past year.
Basically when i switch the system on i no longer get and POST screen and nothing happens on my monitor it just stays in standby mode.
Everything seems fine on my motherboard and all fans are working, the hard drive light stays active on the front of the tower for a while then stops.
i have tried a different graphics card and both the standard and digital cables for my monitor. im not sure what else to try, does anyone have any suggestions or had similar problems?
My system is resonably old by todays standards but has not given me any trouble untill now.

P4 3.2 pentium 4
2 Gb matched corsair RAM
120Gb samsung spin point HDD
120Gb Maxtor HDD
Xfx 6800 GT 256mb Gpu
creative Audigy soundcard
Antec true power 430w psu

 

[Jaridan]

Yeah was reading your thread earlier.. its a real bugger! I've never had any problems with this build before but it's age is making me think something is maybe on the way out through use. I've tried two different cables both the digital and d sub ones and tested the monitor on my laptop to rule that out..
Next thing on the list is a complete strip down, maybe i'll find a loose connection or something..

 

[Jaridan]

Im starting to think it may be the mobo as well, i took the entire system apart even tim cleaned the cpu and reapplied some artic silver. put everything together and low and behold it booted! uninstalled a program had to reboot and yet again no visuals on the monitor!
I have left the system running for about half an hour and what do ya know, its booted up again?
weird..