MP 1,1-5,1 Xeon 2.93Ghz Dual CPUs Stuck at Apple Logo in Boot Up Issue

[Macsonic]

A client of mine was using his 2010 Mac Pro with dual Xeon x5670 2.93 Ghz cpus. His Mac Pro went to sleep and hanged when he tried to start using it again. He did a forced shutdown and restarted the Mac. Booted up with the chime sound but got stuck to the Apple logo. No progress bar.

I took out the pair of 2.93 Ghz Xeon cpus and installed a different pair, 2.66 Ghz Xeons. This time his Mac Pro was up and running perfectly. For troubleshooting, I then installed the problematic X5670s 2.93 Ghz to a different 2010 cpu dual tray in a different Mac Pro. Booted up with the chime sound but showed the same behaviour getting stuck at the Apple logo with no progress bar. Anyone know what could have caused this issue and any solutions? Xeon cpus stopped working? Inputs appreciated.

 

[tsialex]

A client of mine was using his 2010 Mac Pro with dual Xeon x5670 2.93 Ghz cpus. His Mac Pro went to sleep and hanged when he tried to start using it again. He did a forced shutdown and restarted the Mac. Booted up with the chime sound but got stuck to the Apple logo. No progress bar.

I took out the pair of 2.93 Ghz Xeon cpus and installed a different pair, 2.66 Ghz Xeons. This time his Mac Pro was up and running perfectly. For troubleshooting, I then installed the problematic X5670s 2.93 Ghz to a different 2010 cpu dual tray in a different Mac Pro. Booted up with the chime sound but showed the same behaviour getting stuck at the Apple logo with no progress bar. Anyone know what could have caused this issue and any solutions? Xeon cpus stopped working? Inputs appreciated.

Did you check for any oxidation on the contacts of the problematic Xeons?

I had this issue one of two times in the past and since then I started to clean the contacts whenever I'm going to install a Xeon. Usually I clean the contacts with a soft paper, then apply a good quantity of contact cleaner spray, paper again to dry, compressed air to clean any residues.

 

[Macsonic]

Did you check for any oxidation on the contacts of the problematic Xeons?

I had this issue one of two times in the past and since then I started to clean the contacts whenever I'm going to install a Xeon. Usually I clean the contacts with a soft paper, then apply a good quantity of contact cleaner spray, paper again to dry, compressed air to clean any residues.

Thanks Tsialex for the suggestion. I'll check and try to clean the contacts.

 

[tsialex]

Thanks Tsialex for the suggestion. I'll check and try to clean the contacts.

Sometimes there are so much oxidation, thermal paste/adhesives residues that I have to clean with a brush and dish soap before anything, let it dry on the hot sun for some hours, clean again with IPA, dry with a soft paper, lot's of contact cleaner and finally compressed air. Got several bad behaving processors working again doing the above.

 

[Macschrauber]

I watch the color of the cotton swab I use with IPA and clean until it stays white.

Sometimes you will need quite a few.

I don't use plastic ones for ESD reasons - plus a grounded ESD workbench of course.