Commodore 64 trouble. Please help!

[MrPagelsBrother]

I bought a C=64 yesterday, and when I turn it on, it works fine for about 20 minutes, but after that it always shuts down. Blank screen, no response. When I switch it off and on, it works for a few seconds and then shuts down again. When I let it rest for a while (a few hours), it works, but again shuts down after 20 minutes. I assume something is overheating?

The only other thing I've noticed is that the background noise -- that soft "whirring" that sounds a bit like a small electric fan or motor -- is a bit loud on this machine. Could that be related?

Any thoughts would be tremendously appreciated. Thanks!!

[MrPagelsBrother]

A little research has suggested that this may be a power supply issue. I am wondering if I can use the power supply from a (newer) Commodore 64C?

The original brick reads:
INPUT: 117V 60Hz 40W
OUTPUT: 5VCC 7.5W 9VAC 2.5VA

The new one reads:
INPUT: 117V 50/60Hz 40VA
OUTPUT: 5VDC 7.5W 9VDC 6.7VA

Will this new power supply kill my breadbox?

[lbpd716]

should be fine..

[BenjaminLumen]

PS
then Canned air directly onto the chips themselves in the Computer itself..

See if you can keep the machine on for longer then 20 minutes with the use of canned air.