CPU fan starts and stops after 1sec, after not used for a year

I have read many topics where the CPU fan starts and stops after a second, but 95% the computers are new builds. So, I'm starting a new topic, hoping you could help me, because mine is an OLD build.

A friend helped me build a computer 3-4 years ago. I don't remember all the details, but I had an asus f2a85m-le motherboard, a 650Watt power supply, two kingston 4Gb RAM DDR3 and no additional graphic card or anything. I also had two HDD hard drives, the one brand new. The computer was working perfectly on windows 7. Then I had to live abroad for a while, so I used only my laptop for a year and the computer was closed in a carton box. It needed to be moved by one place to another but it was done carefully by me. I come home, I tried to tu it on, the motherboard's fan starts and after a second stops. If I press the button again, it won't even do that. I have to tu off and on the PS in order for the button to work again and for the fan to spin for a second.

The weird thing is that twice unexpectedly the computer powered on. Unfortunately, the first time the monitor wasn't on. I tued the pc off, connected the monitor, tried again, nothing. The next one, I just plugged the PS in another plug, it showed the first screen with the motherboard's brand and then nothing more. I tu the pc off, without doing NOTHING else, tu it on and it won't boot again.

I have done the followings:

• Checked if the PS (both 4- and 24-pin) was connected right.
• Looked for any bued capacitor or something, but didn't see anything.
• Moved the plastic jumper cap from pins 1-2 to pins 2-3 and then again to 1-2.
• Isolated the motherboard on a non-metal surface and tued on the PS, nothing.
• Tried with none or one RAM and replaced their positions (I don't have a speaker installed, so can't tell you about the beeps).
• Removed and replaced the CMOS battery.
• Connected and tested the PS to another PC and works ok.

What should I do now?? It just seems very strange for the motherboard to died on its own..

I will try the 3rd step from this article too..

http://hipstermag.blogspot.gr/2015/11/how-i-brought-dead-motherboard-back-to.html

Also, I'm not very familiar with computers.. Let's say the motherboard is dead. What am I supposed to do with my HDDs even if I bought a new one? All my files are there, so I don't want to do a new windows installation..

Sorry for the giant message and thanks in advance!

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