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power supply problem possibly? I dont know about the pwr light staying on but i knew someone who had mostly the same problem and it was clogging with dust and overheating. you might want to open it up and wipe it down to see if that helps
try to change the source, that should solve the problem. But before try reset CMOS. (if you don`t know how to do it by jumper simple remove the battery from the mainboard for 5 minutes and then plug it back on..and after that turn on your computer and press F1 for default settings)
If you are turning off your computer by pressing the front panel power button, it is probably just putting Windows to sleep but not shutting the computer off. If your computer has Windows Vista, the default is to hibernate and not shut down even if you shut down through Vista. The "power save" message you see is coming from the monitor, which is letting you know it isn't getting a signal from the computer anymore but the power is still on. Windows will start up again from sleep mode if someone or something moves the mouse or presses a key.
The solution is to make sure the computer is actually shut down. In Vista you can do this by clicking the arrow near the power icon on the Start menu. This gives you the option of shutting down instead of hibernating. In XP, shut the computer down using the start menu shutdown option instead of the computer power button. Then the power will shut down completely.
Could very well be a heat problem. You may have an accumulation of dust and dirt inside your laptop case. Laptops don't have much room for air circulation and even a small amount of dust and dirt buildup can cause random shutdowns to keep the motherboard from overheating. Using some compressed air in a can, blow out all of the dust and see if that helps. You may need to take it to a computer repair shop to have them open up the case and give it a good cleaning. They will be able to wipe all the fan blades clean and help with other dust areas. I don't recommend you trying to open the laptop case by yourself because it can be extremely tricky and something might get broken. Hope this helps.
Could be a few different possibilities-
Power Supply failing
first thing i would do is to try booting the computer up into safe mode with networking. to do this:
Shut off your computer and turn it back on- immediately start pressing the F8 key repeatidly until you get an advance boot menu- then go to safe mode with networking and press enter on your keyboard- See if Windows operates normally while in safe mode- If so then issue is probably a Virus.
The problem more likely seems with the power supply or the front power button. Donnot try switch on the computer again and again it may cause damage to the motherboard. Use the following link to pin point the problem.
Buy a new Power suply, they can carry a high voltage charge in there capacitors even after being unplugged and messing with it can get you fried, I did it once in my younger days and it feels terrible. Thankfully it was a small one.