The GPU is often not detected when the owner reloaded Windows. Most folk are not seasoned and don't know to install motherboard and chipset drivers from the makers. They think Microsoft should have this covered. (nope.)
Try the usual reset (in short, remove power, unplug battery, press and hold the power button for 60 seconds, release, slip in battery, apply power and test.) If that fails you can try a new CMOS battery, do this reset again and after that it's off to replace the mainboard. Any service call here runs over 150USD so hope you can get a board for that or less.
So I decided to clean my laptop so i took everything out and washed the dust off. After I reassembled everything again it said that the dedicated gpu - 520mx wasn't detected.. nor nvidia control panel could detect it, nor device manager. So I though that if i update the bios it would fix it.. big mistake apparently since updating bios through official asus website seems to be unstable? While I was updating the bios it suddenly stopped after it was finished and whole screen went black.. now it's stuck on black screen forever even if you restart the pc. As long as the laptop is plugged it will autostart itself and the fans will be spinning.. but on black screen. If i decide to hold the power button it will start and stop forever.. again all on black screen. Updated bios through asus EZ Flash utility.
Tried plugging out sticks of ram one at a time - no effect
Tried clearing cmos battery - no effect
Tried some weird keyboard combinations - no effect
Any tips would be awesome
Laptop is Asus k53sc
Updated from Version 216 - 2011/09/25
to Version 221 - 2012/12/12