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"No signal detected" HELP

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Hello guys I am new to this site and I basically came here for assistance.
So basically the other day when I started my PC this came up on my monitor "No signal detected", also my keyboard and mouse didn't light up.
So I spent hours on googling and trying to resolve the problem with solutions that people with similar problems had tried out.
This is what I have tried this far:

-Unplugging Everything (keyboard, mouse, powercord, Double-DVI)
-Pressing power button for 30 sec and then plugging in power cord
-Taking out the CMOS battery for 12 hours
-Vaccuum clean the whole PC
-Unplug and replug RAM
-Changing monitors(still same problem)
-Changing cables

What really bugs me is that all fans is working fine AND now for the important part

When I took out the CMOS battery and booted my PC it took like 5 minutes before my monitor, mouse, keyboard turned on and it gave me two options F1 to run the BIOS SETUP or F2 to continue.
This have happened me 3 times in total during a period of 12 hours.

When I press f1 I get directed to the normal BIOS MENU and everything is on default.
When I press f2 It starts windows as normal and I have everything on my desktop as usual (only time and date is reset)

First time I thought everything was fixed but when i turned off my pc and restarted I got the same "No signal detected" problem all over again.

It's almost like it didn't save the reset or something.
I'm rly desperate and it almost feels like the it works randomly, sometimes it does but mostly it doesn't.

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