Computer POST cards A2 and D7 cannot be opened.

It's not on the screen, is it? Is it okay to use the original hard disk? That's still a problem with the SSD you bought. Don't be preconceived. Who says the new one can't be a problem?

Don't plug in the hard disk first, and then use the USB flash drive to start. At the startup interface, insert the SSD, then enter PE, format the HDD again, and try to reinstall the system.

Peng Qi Electronics, Yanshan University, Qinhuangdao, Hebei Province, hopes to use professional quick answers.