No video or sound cards are installed, am only using i5 CPU's internal graphics (Intel HD Graphics 2000)/Realtek HD sound.
Problem: Random freezing every few hours, needing reset to re-boot, problem has been present unchanged ever since new build.
Symptoms: PC/Screen freezes with a vertical array pattern of blocks of bars across screen + top 70% screen has fast flickering colour horizontal line pattern (like an old TV with horizontal hold problems used to show), superimposed over the frozen last image, accompanied by loud hum/buzz on sound. (See example screenshot photo file attached). Not monitor problem.
Will be OK for hours on end, or occur within first 15mins, possibly is more frequent when playing/recording music or editing video with Sony Vegas, but never seen with just Desktop running. Don’t use PC to play games!
Averages 2/4 times a day, usually with only low loads on CPU, and temperature ~30deg - so no overheating.
Latest drivers installed OK, – Mostly no system events found in the events file immediately prior to freeze, often for up to several minutes before. Error log message says 'unexplained event caused shutdown'.
CPU runs Intel Stress Test program perfectly OK (temps peak at 60deg, on the 4min 100% load test cycle - which test states is 40deg below max. so no issue there), and Memtest86 runs 10 hours OK, so 8Gb memory appears working fine.
Q: Is CPU or Mobo likely to be faulty culprit, or is there another senario?
Any help identifying problem appreciated.