POS cashier system reported EFI Shell version 2.00 error

Problem 1: when this happens, the hard drive is broken, so you don't have to try to repair it, just replace it with a new one.

The cause of this problem is: voltage instability and frequent power outages

Problem 2: this situation can be solved.

Yesterday, when I installed the operating system on POS, I found that there was such an error after installing the xp system twice. Finally, I was ready to install the win7 system. After the installation of the win7 system was completed, I formatted the win7 system again, and then installed xp and found that I could install it again. This is how the problem was solved. Maybe it was caused by holding down the Delete key and going directly into the xp installation interface. At first, I thought it was caused by BIOS, and I was going to brush BIOS. As soon as my colleague said that the BIOS of this model could not be found on the Internet, the problem was solved coincidentally, and I was confused to ask the reason.