Can Anyone Help Me???Power/Visual problems

[BLAKEY]

For some reason, my computer will...

1.turn on but no picture will come to screen, disc drive won't open, just none responsive-it doesn't sound normal when it turns on, seems higher pitched.

and then

2. When i try to turn it off it just won't turn off, even if i hold down the power button forever.  

Anyone got any ideas what i need to do?? Any help would be appreciated

Thanks
Blake

[honvetops]

1.  Did this just happen.
2. Did any thunderstorms go thru your area recently, do u have a power surge protector for your puter ?
3. Has anything been making different noises as of late, ie..  the power supply, cranky noises from the hard drive area, popping sounds ?
4. Please post your complete system profile( puter,hardware, processor, etc..) for me and others to see what u have, thats important.

[GX1_Man]

Please see below. Information and history is required, unless you just want a lot of guessing.