You mentioned that you don't want to spend much time on this.
For those of us who've spent some time on the commercial side of IT, time is money. If an engineer wasted two days attempting to diagnose a fault on a PC, they would soon be looking for another job.
Sure, server side complex/critical problems, spend a couple of days if you must .... but at desktop/laptop level, spending a couple of days is positively unheard of. In the amount of time wasted, you would have already rebuilt the thing and restored any files from backup (if applicable).