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Google cmos battery on your board You will get pictures.
Hopefully it is readily accessible. Some can be a real PIA to get to.
If defaults do not help you see if you can use a hiren 15.2 disk to make changes to your video settings.
This is basically an OS issue. If nothing works yo may just have to wipe the drive and reload it from scratch.
Sure--remove the system battery, wait maybe 15 seconds, and put it back in. Also, there is a CMOS reset jumper close to the battery on most motherboards. Simply move the jumper from it's "run" position to the "CLR CMOS" position for a period of 10-15 seconds. Now restart the system.
Black screen with "Enter Password" in blue box. - BIOS password. To reset: take the CMOS battery out then place it back again.
Black screen with Enter password in the upper right left corner - could be hard disc password., If you set up the password before, you can only bypass that by entering the correct password. If not, it will render the hard disc useless.
Try to reset bios. you will find 3pins near cmos battery 2 and 3 pins will be shorted to short 1 and 2 by putting the jumper and run the cpu.. once its reseted replace to the default pins
open the cpu and find the mother bord . Then u see 1 cmos cell on it pull cmos for 15 minutes cell so your bios is reset . Alos u can reset bios with jumper settings it is near cmos set jumper in 2-3 position then start computer then again set jumpewr in 1-2 position then your bios is reset. Let me know if u need more assisatnse
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