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take out the battery, then take out the memory. Put one of the two memory modules back in, and turn it on. If everything looks ok, shut down and put the other one back and try again...if everything is ok...then ok. If it doesn't work after the first one, let me know...
This may be a hard drive issue, remove the hard drive and power up the computer it should show the HP logo and go to black screen with a blinking cursor, turn off and re-seat the hardware back in place and restart the laptop, any change? if the same, reload the recovery disc if available this will prove if it's a software issue or hard disc problem. If there is no improvement the hard drive should be pulled and tested at a computer shop before buying a replacement.
I have had this same problem with a HP DV2000 and the
problem is not the contrast light. What it is, is that the laptop
thinks that the screen is been shut down that is why the light does not
come on. The best way to solve this is to remove your keyboard first.
can remove the keyboard by removing exactly 7 screws from your laptop
back, there are 5 screws located under your battery and other two that
are in the location of your RAM'S.
Just open them up and then
you will notice that the key board pops out abit then just simply take
it up and then just below the keyboard, on the same line where HP brand
logo is on your machine there are two small clip types of pind, that
you can remove and put back. There is a clip that is hidden abit
under the metal plate, so just try and remove that clip from its place
using a needle or any long and thin object.
That will make the
laptop not have the problem. But once you remove that the laptop
constantly will think that the screen is open even if you close it.
then after like a week or two you can put it back and all shall be fine
if not then just remove it and keep it out.
You can then set
your power options to shut down the screen light every 2 minutes or
something like that so as to avoid the backlight being switched on all