Asus laptop black screen after firmware update

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

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Wish you had asked first.

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.

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why it broke

Restarted a couple of times the pc to see if it would locate the gpu - it didn't. That's why I wanted to update the Bios.
Tried that yesterday - absolutely no effect.
At this point if the mb is bricked it would be cheaper to buy a new laptop than this 10 year old garbage.. Why would it brick though? That's my only question - Updated directly from the official website without changing any microcodes or whatever.. and it just broke..

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Plenty of reasons.

From wrong BIOS to it's 10 years old. These are just 5 year designs so when it dies is anyone's guess. It may have nothing to do with the BIOS update as it's old enough to die at any time it chooses. This can confuse those that think a 10 year old laptop shouldn't die.

As to replacements our office shops the refurbs on groupon and for simple office work. Usually 128 bucks to at most 250USD for anywhere from an i3 4GB 320GB HDD to better. We stick with W10 since we are not going to deal with old Windows.

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