Power Supply or Case Switch Problem?

I installed a psu a friend gave me due to my old generic one causing random reboots, & fussed up colors on my screen after turning the power on. His psu has worked fine for 2 weeks! I had unplugged my Pc from my power bar for a few days in order to use something else in it's spot.

I go to plug the Pc back into the power bar today, & hit the switch on the back of the psu. The network card green lights on the back panel of the Pc lit up green as usual. Than I went to hit the power button on the front of it's case, & my Pc turned on for a second than off on it's own. I tried again, and it did the same thing... I than flicked the switch on the back of the psu, & waited a bit. Flicked it back on, network card lights kept coming on as normal, than I hit the power button on the case. All of a sudden the lights on the front power button started flashing off, & on repeatedly until I held the power button to hard shutdown the Pc. I than flicked the psu switch to off, than unplugged the cord, and turned off the power bar. Plugged it back in, network lights came on (normal), than hit the power button. It wouldn't turn on at all now... Flicked the psu switch to off, and flicked it back on.

I pushed the power button on the tower one last time in case the psu was going to fry my system from messing about too much. And it finally booted up!!! It went right into the bios for some reason, and said it detected a CPU change, asked me to select the proper speed, every other setting seemed to be unchanged in the bios. Now the Pc is booting into Windows fine.

I turned it off a few times now, including the switch on the back of the psu, than turned the computer back on. It continues to turn on fine...

Any ideas what could've caused this issue? And what I should look to repair if it happens again?


Thanks

 

Edit:

I should also mention that the Pc is always in the opposite position. The back I/O panel faces me as it is a spare Pc (although my most powerful). And I keep the back facing me for personal reasons of use. So I generally almost always press the power button on in a kind of slanted angle from overhead. In my opinion I may have pressed it in a slanted angle too many times which may have caused the problem. I am now pressing it directly from the center of the button from now on (still overhead). In order to avoid any damage... Btw I should also mention that the new psu is also generic but better than the last!

 

The case's front panel power button simply shorts two pins on the motherboard together. Pressing the button at an angle may (though I doubt it) cause abnormal wear on the button, but it would not cause the computer (or PSU) to act up - unless completely broken.

I personally do not like power strips. A good UPS with AVR is a much better solution.

The BIOS detecting a different CPU is a bit odd and that would suggest to me to change out the motherboard battery. They are cheap so little is lost if not it. Just make sure you unplug the computer from the wall and touch bare metal of the case interior before reaching in. Replacement batteries can be found at most battery/camera/watch counters. Take the old one with you in case the number needs cross-referencing (typical battery is a CR2032) and because most counters recycle the old.

Do not touch the new battery with your bare fingers - skin oils attract dust and promote corrosion. I put a clean sock over my hand.

Even brand new PSUs from the most reputable makers can fail. If generic, I would be leery.

 

This happens usually when a the wrong speed or combination of settings is selected when trying to overclock which causes a failed boot,after a couple of failed boots the motherboard automatically underclocks the CPU multiplier or a number of bios settings to allow the computer to boot and enable you to change the the settings.

This error can also happen if the computer fails to boot for any other reason such as a bad power supply or simply turning the computer off during the post test.

Check everything is running at rated speed.