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If your laptop appears to boot up and the hard disk LED flashes, then the problem is probably a back light fault. This can be a faulty inverter or a faulty CCFL lamp. Please click on this link and follow my instructions to identify the fault and possible fix :- http://www.fixya.com/support/r3598095-faulty_laptop_lcd_screen
your laptop is sending video through the hdmi/sata instead of to your laptop screen. Usually when you unplug the hdmi cable it will automatically revert. You have 2 options. One you can hook back up to your tv and use that as a monitor to go into your display settings and reset your laptop screen as the default. Second, you can start up the computer in safe mode and then change the display settings back to the laptop screen as the default. If you get into safe mode and you still dont see anything then the problem is most likely your laptop screen itself has gone and this is all just one big coincidence.
shine a flashlight on the screen when you turn it on and look from different angles. see if you can see a very faint picture. if you can then the backlight has gone bad, and can be ordered on ebay for fairly cheap. if you can't see ANYTHING then more than likely either the graphics card has issues or the screen itself went bad. it's kind of rare for a screen to just go bad like that but i have seen it before.
This may cause by an electrical charge in the motherboard itself,Im not really sure how it affects the display of the computer.There's also a possibility that the problem is with the LCD cable or the LCD itself. Please follow this method since it usually fix such problem like that,
1.Removed the battery then unplugged the AC adapter
2.Press and hold the power button or the ON/OFF button for at least 30 seconds
3.Connect the power supply back to your computer then turn it back on.
4. Check if you will see any difference.
5. If nothing happens, try to press and hold Fn and F2 on the keyboard.
If nothing happens, there is a possibility that the problem is with the LCD or monitor itself, maybe it will need a replacement...
I hope this information will be helpful. Thank you for using FixYa...
If you don't see anything at all and it has not been dropped or banged it maybe something as simple as the Video out selection. Look at the keyboard and locate the [FN] and the [F4](Actually look for the key with a small video screen on it which is usually the F4 on HP machines). After turning the computer on press and hold the [FN] key then press the [F4] Key. There are 3 modes programmed into the video selection. Computer monitor, Computer monitor and External Display and External Display only. What happens a lot of the time is someone may have accidentally pressed this combination of keys and the video is actually redirected to the external monitor only option. If this does not help and you can connect the computer to an external monitor and use that key combination to get the output to that screen then the problem is most likely the Back light for the monitor of the screen itself. Both can be replaced. HP can provide the back light part at a reasonable price. For the screen itself I recommend you go to someplace like E-Bay and purchase the replacement. Make sure you look at the sellers past record so you don't get taken. I DO NOT recommend using Craig's List for anything.
perhaps you might need to reset or enable the correct boot sequence in the Bios settings of the pc. On some pc's you press F2 whilst booting to get to the boot sequence pages,,,,navigate then using the "tab" of arrow keys , Familiarise yourself with these setting and pages you wiill have a chance to save and exit. Press enter to change a value or reset completely to default setting if you wish Goto "boot sequence and learn how to get the pc to boot from different devices
can you see anything on the screen at all? Look very closely at the screen from different angles under a strong light and see if you can see a faint image on it. If you do it means the back-light is not turning on which is usually a failed inverter board (cheap and easy fix). If you can't see anything at all on the screen then either the cable is not seated properly or is bad (not very common) or the screen itself went out (more expensive repair)
The screen uses very high voltage to light a very small but powerfull little flourescent tube
it is either the inverter that powers the tube or the tube itself
When my one failed i had a spare computer monitor at the time and managed to hook it up with no problem, backed up my files, and ordered a new inverter of ebay for about £30 unfortunatly it was not the inverter but the tube so i had to buy a new screen around £70 -£100 changing it was a bit fiddly but no big deal , hope that helps