Power up and shut down problems
My Mac Pro 2008 version has been experiencing intermittent problems for 6 months now and Apple have not yet been able to get to the bottom of this issue.
Initially the machine was not starting up properly ( it would not power up at all - light would come on for a few secs then click off ) and after trying SMC resets and PRAM resets, memory stick checks etc.. i took it into the store.
I was told that the problem may be power supply unit or logic board related... but that on further inspection the problem did not replicate and machine was working ok... So i carried on with machine for a few months with no problem...
Then the same issue started happening and it would fail to complete power up... On taking it back into the store a new power supply unit was ordered but then not fitted due to being told that machine appeared to be working ok...
And now a few months later it has started to cause problems with start up - and sometimes takes 6 or 7 attempts before a succesful start up occurs...
I was advised to try a hardware test and get a error code 4MOT/1/40000002:EXHAUST-0 which i have no idea what it means....
On installing a system checker 'istat widget' it seems to say that my Exhaust Fan has rpm of 0 - i'm not sure if the app simply cannot detect the fan or if this fan should have a diferent reading...
I am now no further forward in getting this sorted but have booked another appointment with apple store..and want to give them as much info as possible
I think they should have already done a hardware test and be able to pinpoint whether this is a logic board / power supply or exhaust fan issue... I am not sure if this may be related to reason that the machine also shuts down when put into sleep mode ...
Apart from that machine works fine!! Any help appreciated.
Mac Pro, Mac OS X (10.5.8)