Any friendly PC technical / troubleshooting wizards out there able to help me diagnose a PC problem please? 

Yeah my tweet is a post-investigation summary. Ah now I see you are responding to the help request. :D
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After investigation, subtle water cooler leak over MB section and CPU. Replacing both plus cooler. Also now need DDR4 RAM.
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Wow, nasty!
End of conversation
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Veteran games dev community manager & designer. Loves
He/Him