|I doubt that it is your power supply, but I will include a reference on how to do a crude test on the power supply. If it passes the test, it might still be bad, but if it fails the test, then it is bad for sure. Many people recommend a new power supply when a computer doesn't work, but it can be so many other things... |
I suspect that your motherboard has gone south, because there are so many unrelated symptoms. But, before pursuing this run the power supply test first and then to the following troubleshooting:
If your computer won't even boot to the bios screen, then the first thing that you should do is turn it off and pull the plug or, at least, turn off the power supply on the back of the computer. Let it sit for an hour or more and try again. If this cures the problem, then when you're finished for the day and shut down, always turn off the power before you leave.