Hello tomherry! And
It could be a number of things depending on your detailed symptoms. Are you saying that sometimes it works and sometimes it doesn't?
Have you thought it might be an over heating problem? Does it boot when 'cold' but when you try and reboot once it has frozen you get the blue sceen?
Also, if you can get any information from the BSOD it would be appreciated.
It could be a problem with your RAM or your graphics card (if you have one).
Remove the side of your computer and see how hot things get. You can also use a free program called speedfan to check your temperature sensors, anything above 50 C could be an issue.
If you have more than one stick of RAM you could try and remove one and see if the BSOD still happens. Do this with every stick to see which may have been damaged.
Basically, there could be many reasons, but we need more information, so try the above and give as much detail as possible and I am sure we can find the problem even if we can't fix it
crabby