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If your laptop appears to boot up and the hard disk LEDflashes, then the problem is probably a back light fault. This can be a faultyinverter or a faulty CCFL lamp. Please click on this link and follow myinstructions to identify the fault and possible fix :-
http://www.fixya.com/support/r3598095-faulty_laptop_lcd_screen
It might be the plug on the headphone that's bad - try it on another laptop. If it's the jack that's bad, then it will need to be taken apart and that's not easy to fix - recommend having a repair shop fix it.
I just repaired the same laptop & problem. I was not the graphics controller. It was bad RAM. If there are 2 DIMMs installed, try one at a time. Most likely one went bad, you can leave the bad one out and fix it for free, or you can replace it, although I'd replace both with a matching pair if possible... you still should be able to fix it for <$200 even if you gave it 4GB of RAM!!!
It would be oen of three things... in order of cost;
1. LCD Invertor has gone bad
2. SCREEN has gone bad
3. Motherboard has gone bad
In either of the three it would most likely take a toshiba tech to pinpoint exactly the problem and do the repair. Although if you are handy enough you can get the parts and repair it yourself.
The battery could have gone bad. Or if you use an ac adaptor for power the adaptor might be bad.
Also try looking on the bottom of the laptop near the battery slot. There might be a reset button, if there is get a paper clip (or small pointy object) and hit the reset button. This works alot of the time.
go to compaq.com and reinstall the hot-key software for your laptop. seems to be a bad driver, could also be bad hardware though, if it is bad hardware you may be looking for someone to take it apart to fix it. more than likely though it is a driver which can be fixed with just installing new software.
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