computer displays no video :(

[prolific7]

here are the specs of this comp

p4 2.4ghz / msi 648 max motherboard / 512 mb pc2700 ram / 350w PS / Radeon 7500 Video Card

when i turn the computer on it doesn't display video onto the screen ... it was working fine for 2 years until suddenly this happened out of the blue.. i had made no hardware changes to the comp .. unfortunately i dont have a pc speaker so i dont know if the mobo is making any beeps telling me which part is the problem ...

what is most likely the problem here ... i have put both the ram and video card in a secondary computer and both seem to function fine ... so could the problem be the motherboard ? when i press the power button the PS turns on , the cpu fan starts spinning, the fan on the video card starts spinning as well .. so the PS seems to be fine as well ..

 

[Xernex]

You have probably already checked but make sure the connection between the monitor and video are properly secured. When you put it in the 2nd PC did you use a different monitor/monitor cable? If so make sure you try your normal pair.

 

[OverVolt]

reseat AGP + PCI cards

 

[DAPUNISHER]

Try the advice offered, if none of that helps then try clearing the CMOS, unplug the system and hit the power button a couple times to discharge the caps, then wait 10sec and put back to default and try again. Still no go? Try the other system's PSU.

 

[Paperlantern]

i'm 99% its the PSU