Ok, something like this happened with my kids MSI K9N NEO-F AM2 mobo, but without the beeps.. couldn't or wouldn't post at all. The mobo itself was gone bad, I switched it with another mobo and all worked well again. It isn't always the video-card when you can't post.
I check it in this order IF THE MACHINE TURNS ON BUT THE SCREEN IS BLANK... but then you have to replace things with new ones to check it.
1: Motherboard!
2: Graphic Card
3: RAM
Now it is easier, less pain-staking and also LESS EXPENCIVE to do it in another sequense, like checking the RAM first, or the graphic card, but all in all it is a time-taking experience either way what you do first and last... and it all depends mostly on how lucky you are how fast or in what order you find the faulty part.
Now if the computer turns on, but within seconds turns it self off again it is more likely that it is the CPU gone bad.
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