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My PC just stopped showing anything on the screen but looked to be working so I replaced the Video card still no good I have replaced the Motherboard, CPU, Power box, and now it just starts to boot then beeps once and stops. The Power box was a 450 Watt and I replaced it with a 350 Watt box could that be the problem?

Answers :

You've replaced quite a bit. I'm figuring that your monitor was OK when you replaced the video card. If your PC has on-board video, it needs to be disabled in the BIOS before inserting a video card..

Then, reinstall the old 450W power supply to see if there is any change.

If still a problem, I would suggest testing the memory. Test one module at a time to see which is faulty.

Hope this helps.
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