I've found this problem so strange.After a month of the installation, the machine gives this kind of error.The machine started up then after a while it gave an error SC982.Then the machine went off and on several times.As indicated in the manual, the NVRAM is defective.I changed the NVRAM the following day.The machine is tested and it worked fine..I thought this problem was solved yet after two days same problem occured.Can anyone help me on this problem?