Sorry to hear about your computer issue.
You said your pc is jammed or stuck when you power it on - so what do you see on screen when it freezes.
Did you change anything in your PC - any Hardware/Software added or removed!!?
Please check if you are able to start your computer in Safe Mode.
Turn off your computer >> Turn On and keep hitting F8 key
If you see an option "Last Known Good Configuration", choose that.