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You may have short circuited your power plug box as well or damaged the Mother board.Try another power supply and see if the notebook powers up.Did you apply some new thermal paste on the CPU chip after you replaced it?..Please let me know the results so I can help you solve your problem without much cost for repairs,thank you :)
Try hooking it up to an external monitor (or LCD monitor) and see if the same thing happens (first attach a monitor then do a cold start). My suspicion (from the a's you described) is that the motherboard is bad - I call it garbage video. Toshiba dealers will probably charge too much for these replacements. If you're a DIYer or you know a reasonable shop that knows laptops, then eBay would be a good source for replacement boards.
all the describtion you sayed means you have a hw problem with the vga card that is built on the mother board ... and it need to be maintained by a pro. so i advice you to go to the computer company that you got the pc from it an they will replace for you the burned device
You cannot replace the backlight. It is incorporated into the lcd panel and not available as a separate part. The inverter board is very easy to replace. It is located right behind the dell logo at the bottom centre of the display panel. Remove the screws on the front of the lcd bezel (under the rubber pads) and the inverter board is right there. Call 1-800-www-dell or look on ebay. Hope it's only the inverter board, as a new lcd panel is $350+. If the display is dead you can still use the laptop by connecting an external monitor to it.
On this model laptop, it is not uncommon for the video chipset to die. When it does, it is very much in the fashion you have described.
Unfortunately the solution is to replace the motherboard, as this video chipset is integrated into the board, not a separate card. You will need to either contact HP... $800ish dollars for a board, or look on Ebay for a new board for your laptop.