My PC broke down twice last year.
The first time it was the power unit and I guess it was a simple fix. But when I sent it to a shop I was charged for disgnosis, labor, and the part for a total of about $180. And it took them two days for the jobs. They just took the time so that they could charge me more.
The second I simply went to bestbuy and get a new one for less than $600.