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Not a guru but:
Take the side panel off and leave a space to sit when you're trying the unplugging-all configurations. Spray down the socks/floor/carpet with water to prevent static. Leave computer off but plugged in for ground.
Be very careful with those air dusters. Keep upright always, and spray to the side initially.
The power supply on older computer can go bad and cause problems with MB, etc.
Seems like the memory and video card are still ok.
If it's not recognizing the DVD disk drive, could be a MB/connection problem, if not software/BIOS....
You can get a Seagate HD from Best Buy for a hundred bucks for a new HD. Comes with cloning software which transfers everything including OS. Acts as a turnkey.
Might be worth replacing a few fans as well.
That's all I know. Best.
Then MS Essentials, CCleaner, Malwarebytes,
Then
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