Non Booting System?

Having ongoing problems with an Acer Quad Core system at work (3 yr old machine). System did not want to boot. It was locked on BIOS. Went through normal procedures and felt crummy 250W power supply was probably DOA. Replaced the power supply with a 400W. Initially I booted windows 7 and everything seemed fine. The next day on boot it makes a long beep/screech sound and as it starts to boot, it turns right off. Any ideas what might be the issue. The graphics card should be fine but we also have onboard graphics to check. Didnt matter same issue. I appreciate any ideas.

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More about booting system
  1. We have a sticky, but it's mostly for home build PC's.

    Not much you can do except start swapping out parts. Either plug current parts into a know working PC, or place known working parts into current PC.

    Problem here is I don't know how much of your PC is proprietary parts, which would be much more difficult to test.
  2. Our standard checklist and troubleshooting thread:

    Although it is aimed primarily at new builds, the troubleshooting tips in it will work on any PC.
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