Hello !
First off, this topic should be moved in the "Storage\Hard Drives" section.
Secondly, the HDD you removed, was it your Boot drive (was your OS installed on that drive) ? Is the "blank screen" a black screen ?
If it was, it could be that after POSTing, your computer can't do anything else because no OS is installed on that drive.
Get back to me on that,
al360ex