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Microsoft Windows 10 (64-bit)

HP Z230 with i5-250 CPU and 32Mb of Dram3 just recently upgraded OS from Win 7 to 10 last week. 
Hello HP experts,
No issues since new Win 10 OS installed last week. I was a happy camper until Today the PC “froze” in middle of Photoshop edits.( I do not use the PC for gaming.) Hoped a forced  restart would fix the freeze. Now the device does not post; followed by a high speed (power supply?) fan 40 seconds after switching  power on. No excessive heat detectable anywhere. 
I have swapped the power supply cable and reseated the 4 memory cards to no avail. 
Your suggestions appreciated. 

my testing
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