Strange A1200 behaviour... caused by overheating?

[StevenJGore]

Hi,

My AT A1200 (see signature for specs) keeps freezing, particularly when using my SCSI CD-ROM drive and/or a program or game that is CPU-intensive.

An immediate reboot or reset either results in a frozen blank screen or (more often) a flashing red screen together with dimming/brightening of the power LED. I have to switch off the A1200 for at least a minute before it will boot properly again. Once my A1200 has frozen (even after waiting a minute before rebooting) it is much more likely to freeze again afterwards than before. After being off for a substantial amount of time, my A1200 is 'back to normal' temporarily.

My immediate thought was overheating of the 030/50Mhz CPU, but since my A1200 also freezes after a while when using a Squirrel SCSI CD-ROM (which I don't think is particularly CPU-intensive, correct me if I'm wrong) perhaps there might be some other cause?

Any suggestions?
Hopefully the red screen will be a clue to somebody.

Thanks,
Steve.

[StevenJGore]

KennyR wrote:
If the A1200 isn't expanded then it won't overheat, even if you live in a desert. Basically you need a Blizzard PPC to overheat an A1200.

But if the 030 CPU was getting too hot, wouldn't it cause the A1200 to freeze or even reset?

[StevenJGore]

PMC wrote:
Have you tried unplugging the SCSI and powering up?

Not sure if I have or not. I'll try it tonight!

[StevenJGore]

It's a Blizzard Mark IV 68030/50Mhz with 32MB RAM.
I'm not sure how fast the SIMM is, and I can't remember what I've got the jumper set to.
 I'll check tonight!