- Have you had any recent power outages, surges, etc. lately?
- Have you checked inside the computer? Are the fans running? Are all cards and cables firmly seated? Do you see (or smell) any signs of damaged/blown circuitry or other hardware? Do the drives sound like they at least try to spin up, or not?
- Does the computer emit any beeps when you try to start it up? If so, describe the pattern/sequence of the beeps.
- Remove any PCI cards (network card, modem, sound card, etc.) one by one. Will the computer boot whenone of those cards is not installed in the system?
- If you have more than 1 RAM module installed, test the modules by installing each one individually and attempting to boot. If the computer fails to boot only when a certain RAM module is installed, replace that module.
- If you have (and know how to use) a voltmeter, check the internal power connection points to make sure the motherboard, drives, etc. are all getting good power.
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