Solved! screen won't come-on

Nov 13, 2018
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My keyboard stopped working a while ago. I checked windows to see if it was still recognized, and windows showed that it was still plugged in and working.
I decided to open the laptop to check if there was anything wrong with the keyboard. I disconnected the keyboards plug and connected it back to see if it would help


Now When I try to turn on the laptop , the hdd boots up, the lights come up, but the screen won't come up



I tried the method where you hold the power button for minute, didn't help
Tried exchanging ram sticks didn't help




Please who has a possible solution can point point out what I did wrong



Specs
HP probook4520s
Core i5-420m
4gb ram
Windows 7
 
Try this...

1. Turn the laptop off (not sleep or hibernate but off).
2. Connect an external monitor to the laptop.
3. Turn on the external monitor.
4. Turn on the laptop.

NOTE: You may have to press an "external monitor" button. Could be the f4 button or a button with two monitors on it, for the external monitor to work.

If you can see fine on the external monitor, then your attached display, or the ribbon cable that connects it, are your problem.

If you can't see on the external monitor at all, or the problem occurs on the external monitor as well, then it is probably the graphics card/GPU that is the problem, which may require the motherboard be replaced.

You may also want to try hitting CTRL + SHIFT + WIN + B to try and reset your graphics driver as another possible fix.
 
Try this...

1. Turn the laptop off (not sleep or hibernate but off).
2. Connect an external monitor to the laptop.
3. Turn on the external monitor.
4. Turn on the laptop.

NOTE: You may have to press an "external monitor" button. Could be the f4 button or a button with two monitors on it, for the external monitor to work.

If you can see fine on the external monitor, then your attached display, or the ribbon cable that connects it, are your problem.

If you can't see on the external monitor at all, or the problem occurs on the external monitor as well, then it is probably the graphics card/GPU that is the problem, which may require the motherboard be replaced.

You may also want to try hitting CTRL + SHIFT + WIN + B to try and reset your graphics driver as another possible fix.
 
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