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When the CPU overheats then it will shut down (i.e. thermaloverload) and won't boot up again until it has cooled down. If this is theproblem is not fixed then the CPU will eventually fail. A faulty fan causes the problem or the fan and heat sink assembly are cloggedwith dust. Check the CPU fan to see if it spins freely, if not replace the fan. If the fan and heat sink is clogged with dust the remove the dust and make surethe vents are clear and dust free. Use a can of compressed air to do this.
by screen black, do you mean constantly black or does it turn on then back off...
If its just constantly dark when you have power and you know its switched on, get a torch and shine it onto the screen... if you look really close you might be able to see your desktop if you can then it tends to mean your backlight inside of your screen has blown. you can buy the replacement part from acer or send it of to be repaired.
Fixing that problem isnt easy.
It seems that some critical windows system files have got corrupted and the 'rocket' seems to be an add on used to change the windows interface to look like vista or windows 7. The only way to recover will be to use the original OS CD/DVD to boot up your computer and use the repair &/or reinstall option. This leaves all programs & data intact, i.e. as it was, but just replace the original system files.
This is going to be with the power management system on the motherboard. These are the classic text book symptoms of a failedpower management chip. Few shops will be able to fix this, most just say replace the motherboard, you might get lucky and find one in your area that can fix it, if not then you will need to send it to Acer for repair.