Have you disconnected your external drive?
If not, please do so (along with it's cables) and see if that helps.
Based on the history of the problem, and the description of the BSOD error code (see "Usual causes" here: http://www.carrona.org/bsodindx.html#0x0000007E
I suspect a hardware issue. The next step (after removing the external drive) is to recheck ALL of the connections by actually unplugging them, inspecting the inside of the connectors, blowing them out, and then firmly connecting them again - then retest.
Another possibility is damage while assembling or dis-assembling the parts. We'll move onto troubleshooting that if the above stuff doesn't fix it.
You start with these free, bootable hardware diagnostics: http://www.carrona.org/initdiag.html
Use MemTest86 (not 86+) as it will boot with any BIOS/UEFI
If you have a BIOS system, boot to the Seagate Seatools for DOS and test from there.
If you have a UEFI system boot you'll have to set your system to disable SecureBoot and enable CSM/Legacy mode
If you don't know which, try booting from the Seagate Seatools for DOS disk. If it doesn't boot (but the MemTest86 does) - then you have a UEFI system
Typically, OEM's provided UEFI with systems designed for Windows 8 or Windows 10.
Edited by usasma, 25 September 2017 - 07:11 AM.
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