Question my pc crashes please help

Jul 31, 2020
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recently my computer has started to crash again it like takes 5 mins to load up and then when it fully started then its responds very slowly and then freezes for a min or two and then crashes and reboots itself i have 2 drives connected one is a ssd which is my windows boot device and the other is my hdd which is storage so just to check i removed my hdd and then my computer works fine but when i reconnect it and start the problem starts again is this caused by faulty motherboard or power supply because on my motherboard not all of the usb devices work and at a time i can connect 2 or 3 if i connect more than that it says usb device not recognizable when i connect external hard disk i have to unplug my one of the usb devices which is mostly my mouse and key board then it works fine