Difficult to say for sure. To shut it off unplug the AC Adapter, remove the battery, then press the Power button and hold it for at least 30 seconds. Now see if it turns on and off like it should.
We need to ascertain if you have some hardware problems or not. To check the ram you need to download the Memtest CD Iso, create the CD using the Burn From Image option, then boot to it and allow it to run through a minimum of 3 complete passes. If it shows ANY errors whatsoever then you have defective ram.
To test the hard drive determine what brand of hard drive you have. You can check the Bios/Setup to find out or run SIW or Belarc Advisor. Go to that manufacturer's support site and download their Self Booting Diagnostic CD ISO image, create the CD using the Burn From Image option (see http://iso.snoekonline.com/iso.htm for more information on doing this), then boot to it and run the most exhaustive tests available. If you have a Toshiba drive you will need to use the Hitachi Drive Fitness Test as Toshiba doesn't supply their own.
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If you don't bother to post your COMPLETE model number it's very difficult to assist you. Please post in complete sentences with punctuation, capitals, and correct spelling. Toshiba does NOT provide any direct support in these forums. All support is User to User in their spare time.
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