My computer knowledge is based on past experience - I have forgotten masses over the years and what I remember is often no longer applicable with today's systems.
So far everything has failed despite best efforts and some sound advice.
However nobody has mentioned hardware & connections. When all else has failed I would strip the main PC down - extract all disks, cards, connecting cables to peripherals etc etc. With everything out I would then reassemble the whole system. Turn it on and watch with baited breath.
The last system that gave me intermittent heartaches was around 2002 - Sun Unix box running Oracle & student records applications. Brand new machine to replace what was a 6 year old box that had ran faultlessly for the 6 years. Apart from being closed down every 6 months and re-booted it had run 24x7.
The new Sun box was running but could hang - it gave intermittent error messages. The Sun technician wanted to replace the 3 disks - setting up the hardware, installing Oracle and the applications represented some 5 days work that would need to be repeated.
Machine pulled apart, rebuilt & re-booted and the problem disappeared - effectively in roughly 1+ hour everything was tip top.
It ran for 3 years then all 4 in the Glasgow office were made redundant - last bastions of Oracle running on a Unix box were surplus to requirements despite still having 25+ Scottish sites running Unix & Oracle - everything was porting to MS + PC hardware.
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