Overheating CPU on replacement

[svoomaz]

Hi, 1st post so be kind.
Had a problem with my Dad's CPU - overheated and damaged after CPU fan died. Replaced fan with a new stock Intel unit and CPU with an old Celeron SX9RL I had laying about. All went well, system stable temps good etc.
Purchased a SLB8V Core 2 Quad (used) and installed yesterday. Got a call today that system was randomly shutting down. Went back and under no load CPU was already at 85C (MB @ 40C). both CPU & chassis fan working normally (obviously CPU fan was working hard).
When installing I removed all thermal paste and reapplied a light coat (dab a little smeared evenly). Made sure fan was properly seated and all looked good.
System is always under a light load - email & browser is all he really uses.

Now for the question: Am I overlooking something or did I get a cooked CPU.
I've got purchase protection but I just want to make sure I haven't missed anything - before I start that hassle.

Thanks for any help, Scott

 

[tsnor]

Verify the bios in your dad's system supports the SLB8V Core 2 Quad q9550 so that it knows how to correctly set voltage, etc. IF you can pull the voltage from the MB verify that it is in the right range (0.8500V-1.3625V), and that it goes up and down with load, for example with HWMONITOR.

Tcase was 71.4°C on q9550 according to intel. 85C is bad news.

Two comments you can ignore:

1. refurb 3rd gen or later i5 based desktops and laptops with win10 are pretty cheap, see neweqq or walmart
2. If your dad's hard drive is circa the rest of his equipment consider a $50 1TB usb drive and making a backup of his system for when the drive fails. Or put the celeron back in and spend $60 on a 128GB SSD which might give more impact.

Good luck.
Try one last paste job, then assume somone sold you a fried the CPU.

 

[svoomaz]

Thanks for the help. The MB is a Foxconn G41MX-F 2.0 - It does support Core 2 Quads - but I'll check for specific CPU. I appreciate the voltage reference and will verify. I'll try the repaste again - and if still screwed - I'll start the return process and put the Celeron back in.
Thanks tsnor