SPCR

hi
im looking for a used pc possibility that in interesting.

could you tell me what components can be tested and what is a good enough result to accept a used pc
for exemple i think i can ask the seller to run memtest86 to tell ? about the ram life still remaining in it.

is it possible to test cpu? mobo? Hdd? what are the name of the tests that i can ask the vendor to do

tx
what test can i ask a seller to do to show me the state of his used desktop

A simple start and get it running tells a fair bit.
There are diagnostics tools, but most of those will either require a license and/or take to long to run. Depends a bit on what level of computer you're looking for. An old/cheap one or something higher end?