07-22-2016 10:15 AM
Did you buy these from the same source? What are the Lenovo model numbers and the Intel processor model in each one?
07-22-2016 12:24 PM
BOTH of these machines are
LENOVO Thinkcentre M90z
Part # 2471-A79
Proc is i5-650 @ 3.20Ghz
The ONLY difference is the Ser. No.
and one is W10 Pro x64 and the other is W7 Pro x64
ALL Else is the same and they BOTH worked well intil "something went wrong" and that @#$^*&((*&^%
30 minute timer got ACTIVATED
Really, Severely, BEEFUDDLED!!!!
07-23-2016 09:48 AM
I thought I might see that they started out as a lowly i3, and had been upgraded to an i5, which might explain the shutdowns. That's not the case.
I've been researching this quite a bit, but I'm now out of ideas.
07-23-2016 06:42 PM
You mentioned possible i3 to i5 swap? Which gave the idea to SWAP i5 for i5
I am going to talk to my supplier and try to get an other i5-650 and swap with the one installed and test.
I wil inform of results!
09-27-2016 04:10 AM
I've been following this post closely as I'm also the proud owner of a M90z that shuts itself off after 30 minutes. Have you had any luck replacing i5 with i5?
09-27-2016 06:44 AM
Have any of you guys try to force the PC on - like in connecting the P_ON pin to GND on the ATX power supply. The CPU can then not turn off the power supply. Maybe this is a viable workaround?
09-27-2016 10:33 AM
The M90Z does not have a standard Desktop ATX power supply, but it is still an ATX power supply with lesser - 14 pins. Green=PS_ON and Gray=PS_OK. The chipset controller is supposed to turn the power supply on and off through PS_ON pin. 5V on this pin should turn the power supply off. After 30 minutes this must be going high in order to switch off the power supply. You can keep the power supply running by shorting this pin to GND. There are no data communication from chipset to power supply (like what you have with laptop power supplies)
I think it is worth a try.
11-12-2016 02:57 PM
It took awhile, but I tried a new CPU which DID NOT HELP....
The broblem is definately the MOTHERBOARD in both units.
SORRY to take so long to try this fix, but a least those who have not damaged their heads - beating them against the wall - will now KNOW that the FIX is = CHANGE the MOTHERBOARD..