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tell me more it boots to windows OS and then locks does mouse work or not if mouse is ok then its a keyboard failure if both are frozen then its an Os related problem or may be hard disk temme more abt it
If you log off you only close your user session under windows, not turn off the computer.
If you suspend you turn off almost everything in the laptop like hardwire, cd or dvdrom and most peripherals but the computer stays on the consuming power.
If you hibernate what windows does is to store all in memory in a temporary file in the hard drive and turn off all the computer so when you turn it on again it will be as you last session with all your programs and documents you left open.
And if you turn off the computer it will close all your programs, close windows and turn off all the hardware.
try sensing if your cpu fan is working, it is under the power switch side, you can see small exhaust slots, put your hand beside it and feel if some air is coming out when you turn on your pc.
When you turn you pc on and only orange light blinks, it means that no power was getting into it, it blinks because no electrical power is coming from your power adapter and the battery is drained. Check your power adapter cable, this is the very cause why your pc is shutting down. usually the wire from the adapter to the pc is faulty.
use your recovery disc that came with your computer to restart windows. or if you have a windows xp program disc this will give the option to do a repair or reload computer with a fresh copy of windows.