Reboot MacBook Pro

after I delete old backup the hd start reboot my Mac as soon I write my password and hit unlock . just the Mac goes black and start rebooting …
I have a passport elite 1T. (P/N: WDBABM0010BBK-00) IF SOME ONE HAVE AN IDEA PLEASE HELP.

Hi myquestion,

Maybe you should try contacting WD’s Technical Support about this.

To Contact WD for Technical Support

https://support.wdc.com/support/case.aspx?lang=en
The link below will allow you to call support.