Toshiba Satellite a75 laptop screen not working! Please read.

So I originally posted last week about a problem with the same laptop overheating and causing the computer to shut down every 5-10 minutes randomly. well, after reading several posts and forums I realized my heatsync was clogged, so I dismantled the entire computer, and cleaned the fans, and heatsync. sure enough, it was clogged with incredible amounts of dust (this laptop I bought already used). This was all that was wrong, until I pieced everything together again and turned it on. No screen. The laptop has yet to shut off, which leads me to believe I fixed the problem with the laptop over heating, but now I still cant use the thing because all of a sudden the screen wont work. What did I do wrong? I'm like 100% sure I pieced it back together properly and toyed with it for the next hour or so.

Hook up an external VGA monitor to the computer and see if you can get video there. Do an FN-F5 key combination to get the video to output to the external monitor. If you get video there, you may have not connected the LCD screen connections correctly. No video on the external monitor may mean an issue with the system board. Again check your cables and connectors. Also that the CPU was properly seated and you have some silicon grease between the CPU and the cooling module.
Finally, those A75s are an old computer and can be purchased on E-Bay for very little. What is your time worth? Is putting $200 worth of time into a $50 computer a good use of a limited resource?

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