Computer stopped working

[Deserter15]

I have a prebuilt pc from about 12 years ago that has recently stopped working.  I'm not sure what is wrong with it though.  It turns on, but the monitor says no signal.  The hard drive works so i'm not sure if it's the CPU or the motherboard.  Does anyone know a good way to know which one it is? (it's an amd sempron 64 with 2 gb of ddr3 ram with an unknown motherboard)

[Tech_Dreamer]

Maybe the onboard video is damaged, try a graphics card instead of plugging it straight to the motherboard.

[Deserter15]

so just pull the card out of my other computer and try it?

[nj4ck]

so just pull the card out of my other computer and try it?

yes. Make sure you don't try running something like a 780 on a 200W PSU, but otherwise, yes.

[Shadow Gamer]

Check your VGA/DVI/HDMI connections from the PC to the Monitor, and also try it out with another monitor. 

[DarthSlater77]

12 years wow thats old. first clean the dam thing then if that dosent work test the powersuply it my have gone bad. it is posible that after 12 years of use that the power suply has just had enough. i dbout that the cpu or ram have gone bad. older cpu's have a larger die size and run at slower clock speeds and rarly have overheating problems. the ram you can test by using only one stick and in each slot but the ram probably isnt the problem. this is how to test your psu http://pcsupport.about.com/od/toolsofthetrade/ht/power-supply-test-multimeter.htm

[chilicheeseburger]

Try different cables to the monitor. Try another monitor as well