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Please check if there is power to the system.
Is this a laptop or desktop?
If it's laptop see if any light turns on in the computer and or if you can connect it to an external monitor to check if the problem is the LCD display or the Video Graphics Adapter.
If it's a desktop see if there's power to the monitor and to the system.
Do you seea any message like no signal or output out of range or is the monitor totally blank?
If you can provide additional information like if it's a desktop or a laptop, when was the last time it worked if there are any indicator of power coming to the system.
Hope to hear from you soon.
There is a little rectangle shape thing next to the lg logo on the top of the fone screen. If this is blocked by screen protector it will cause the phone to blank of during calls. Its a power saver that blanks the phone when its near your face. Try it. Take off the screen protector & make a call. Then place your finger over the little thing & the screen goes blank. Just cut a lil space in the screen protector & that will fix the problem
Keep pressed the power button of your laptop for about 30 seconds, the machine will power down.
--The above step may not be required as already so many days passed by.
Then plug it into the power adapter.
Switch the laptop on.
Boot in "safe mode" (F8 during boot).
This will fix any driver or some operating system issue during previous failed boot process.
Once it boots completely, do a normal shutdown and reboot your laptop in standard mode (no more F8 this time).
Now your laptop will be ready to use.
remove battery,ac adapter and other external medias,then hold on power button for 30seconds
with ac adapter attached try to power on still probs ...then its bios probs need to use bootable disk or recovery disk of your laptop