Hello one day I woke up and tried turning my pc on, but nothing was displayed on monitor, only LED was blinking not even a table with "No Video Signal", but I could hear windows booting up. Then I tried using integrated video card and it worked. My first thought was "VGA is dead", but no I have tried it at my friends PC and it worked.. Could this be the motherboard?
My goodness, I hope you never have any automatic BIOS updates!
If your friend is willing to let you borrow his power supply, try it in your system and see if the card works. If it does, time to get a new one!
You may also want to try clearing your CMOS and using the Optimal Defaults on it. This will remove any custom settings you have in BIOS, so be sure to review all these settings, take notes and save the CMOS if allowed.
If that doesn't fix it, when you reply be sure to include more details. Make and complete model of motherboard, GPU, etc...