Dell Optiplex 755mt
Intel Q35 Express
Intel q9650 / 3GHz (No Overclock, yet?)
4 x 2GB: Samsung 2GB 4GB 8GB DDR2 800MHz PC2-6400U DIMM
MSI GT 710 1gb DDR3 Low Profile
Seagate FireCuda 1000GB Internal 3.5" (ST1000DX002) SSHD (Solid State Hybrid)
Corsair CX500 80 Plus Bronze Active PFC ATX12V & EPS12V
CPU Heat Sink
Dell Optiplex Heat Sink D9729 0D9729
CPU Thermal Paste
Coollaboratory Liquid Pro
80mm fan, 30mm fan, stock CPU fan
Windows 10 Home 64-bit
As far as I can tell the shut downs are completely random. As long as I don't run any applications it will stay on. Once I open an application like chrome to watch a YouTube video there's a chance that a shut down and reboot will happen, but it doesn't always happen -i.e. completely random. When it does shut down it resembles unplugging the power cable while the computer is still on.
This started after I replaced the CPU, RAM, and upgraded the BIOS. It's not a power supply issue because I have tried fixing it with 2 different power supplies now; the base 305W PSU and the Corsair 500W PSU. I have download both CPUID and Core Temp to see how the CPU is holding up and it appears to be doing alright running at between 35C normal load and 55C under heavier load.
At this point I don't know what to try next. I've read that the CPU and Mother board should run fine with the A22 BIOS so I don't know if a down grade to A21 BIOS is warranted. Also, I've never done a downgrade on a BIOS before so I don't know if downgrades screw with other drivers and if I need to do a clean install of Windows. If any one has any suggestions they would be greatly appreciated. I would like to try everything possible before I go buy a new Q9650. I understand that it would have been easier to buy a new computer but this was about the learning experience which has been amazing so far.
If you need any other information, feel free to ask.
Thanks in advance!