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put your key into the ignition turn it to the on position without engaging the starter wait till your gauge cluster settles and try to read the codes at this point as per on screen prompt by the reader. goodluck
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.
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)
If it was the power supply, the light would change to amber (orange) and then turn green again when it comes back on. Look closely at the screen when the it looks to turn off. See if you can still see an image. It may be hard to see, but when the backlights go bad or fail, the actual lcd screen itself still functions and you can see a very faint image. Maybe moving the mouse in circles might help you to be ablt to see. If you cant see anything at all, then it may be a bad board inside the unit.
Just a thought....
I was charging my Sansa and then I look down at it and it was on a blank screen. Now it won't turn on. The computer says that the equipment has malfunctioned. I can not get to do anything at all. It was working fine, all I did was put it on charge. Can anyone out there help me with this problem. Has anyone out there seen this same problem with their unit?