My computer will not turn on if My Book HIgh Capacity is connected to my computer

Everything works if I connect it after my computer boots. My computer just locks on one screen.

Refer the link mentioned below to troubleshoot for such issue. It usually occurs due to incompatibility of the drive with some computers or due to BIOS configuration is setup to Boot from USB device.

https://support.wdc.com/knowledgebase/answer.aspx?ID=15102&h=3

Thanks for the solution