The power supply and graphics board have both been replaced within the last three years.
Everything is clean inside, no visible problems.
On booting it'll usually not find the C drive, but it is a choice from the F10 menu and it'll boot OK once it's told. The battery on the board was replaced recently.
Occasionally the C drive does not show on the F10 menu, but will if I cycle the power.
I'm very tempted to take it over to MicroCenter and just say "Fix it"
For now I'm working on the laptop.