Assuming that the private computer repair store to repair, it is not allowed. Before repairing the computer, you need to do the following:
1. Consult the store computer repair time. If the store told that the same day can not be repaired, need a few days, then give up the repair. Because in the absence of the owner of the time, the store may replace the original parts in the computer, installed the store's assembly parts. Even if the computer repair, but the parts are assembled, the performance is more or less poor.
2. Assuming that the store informs you that the computer can be repaired on the same day, keep an eye on the store for repairs and don't leave at any time. Because of the surveillance/supervision state, the store usually does not dare to do tampering, and can effectively guarantee that the computer parts are original. After the replacement, be sure to verify that the computer is available, if not, let the store rework or let the store claim (it is best to negotiate a deposit with the store beforehand, in case the computer repair fails and causes damage to the motherboard, there will be no dispute).