Mac Pro early (2009) keeps shutting down

Thanks IIIaass

Tried searching for entry that includes BOOT_TIME on startup. How do I do that ? Tried following advice but thought I may have some answers here.

So had control app open during one of the shutdowns which hopefully gives a clue.

As the computer had locked up I took a picture with my phone if this does not help I can try follow you recommendation a little more closely.

OK thanks Illaass

I was able to locate a BOOT-TIME message and also locate messages immediately before. Not sure if any of these are telling so i will copy and paste. I have found this issue a now easily repeatable if i remove the fan if have now flowing difectly into the open chassis. Fill not falter with fan on. Assuming now this is heat (cooling) related.

Something else to note is that putting a fan next to the computer with the case open alleviated any issues this morning until I took it away and had two immediately. May be coincidence? Has been pretty hot here of late so have felt this may also be a factor though not as hot last couple of days. Still the Fan on high today seemed to give me no issues.

This is post crash. Hope its helpful

Just uncontrolled power-down Grant.

David.

Thanks Grant,will look into the northbridge heatsink.

I have checked and this doesn't appear to be the problem though when pulling out the trak one of the heatsink did sound a little rattle inside.

Ok thanks, the temperature monitoring app have done the trick.

I will try find the ideal setting but curious if there is a guide as to what temperatures are ideal for the mac pro (early 2009)