HP Pavilion 500 PC computer case ports not working

I left my computer on for about two weeks. Most likely it overheated the computer case. Yesterday, I decided to shut down the computer for it to update.Next morning I turn on the computer and my mouse and keyboard didn't work. I can turn on the power for my computer, but my computer doesn't respond to mouse and keyboard. The monitor also can't find the computer saying how there's no signal. I tried restarting the computer multiple times through the power button, unplugging the usb cords and the cord for the monitor multiple times and tested the mouse and keyboard on a different computer. When I connect my mouse to the computer it does not show the red optic light on the bottom, but it does and works on another computer. The keyboard also works on another computer. I tried taking out all of the cords off the computer case and taking of the power cord of it and waiting, putting the cords back in and trying again, but i did not work. I tried to go in BIOS, but I am not sure whether or not I am pressing the right key combination or because of the fact the computer is not responding to me pressing the keys on the computer. Also, before I shut down the computer I noticed the computer was reacting slow to me clicking and closing windows sometimes and I do not know if that would be related to the problem. I can't access my computer because it will not react to the monitor, mouse and keyboard. It worked fine when I kept it on and previously before when I shut it down.
Thanks
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The little beep that should be occuring lets you know that your computer has completed the Power On Self Test or POST. This test is a basic test of all hardware. Usually if a component like the RAM has gone bad there will be a series of beeps that communicates what has gone bad. In my experience there are only two reasons why there would be no post code. The first would be that the power supply has gone bad, no power means no POST. However, your fan comes on, indicating that there is still power. Which means the second and far more severe case is more likely here. Your motherboard is most likely toast. I know that is the worst possible prognosis, but I think that it is accurate here. Sorry.
I work on behalf of HP, but my opinions are my own.
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Attachments:
OutloopTrueMode.pdf ‏432 KB
OutofLoopNotWorking.pdf ‏443 KB

Salander wrote:
Dear GerdW,
Thank you for reply, You can see my answers written with red.
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