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When this happened was the laptop overly hot? If the laptop's head got too high it could have shutdown to protect itself. It wouldn't boot until the heat had disparate. Sit you laptop aside for about 30 minutes and see if it will boot then. If it does you might want to check out a cool mat.
Time to look for a new computer. That and take out your hard drive to copy your files over.
Sounds like motherboard problem. Probably not worth repair.
I've got an HP desktop with similar problems. It turned on one day just fine. The next day not. I don't even get the boot up screens. Disconnecting Hard Drive and CD/DVD components do not help. I should at least get some BIOS POST beeps and a Hard Drive Not Found or such. I do not. On occassion it will boot to a blank screen with white cursor in upper left. Most the time no screen at all. On rare occassion it comes right on and boots Windows. I guess it could be the power switch ... but I doubt that.
Try by removing the battery. Try external monitor. check your Monitor/lcd setup by FN keys. If this is not solved, You may have
1- Inverter problem
2- Graphic card problem.
3- LCD bulb is not good anymore.
4- If you upgraded the memory, Try to test one by one, (Remove battery and power before process)
Seems your laptop is overheating.
When it overheats, the laptop shgutsdown as a defense mechanism, to protect important parts like processor.
Check the fans and remove all dust from them with a vacuum..
If that doen;t help, you;ll need to perofrm a deeper cleaning of the heat sink and apply a fresh heat transfer compuond at the CPU.
You mention you have your laptop since 2006.
I would say its about time for a deep clean up
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