External HDD shutting computer down?

Ricster-a

Honorable
Jan 19, 2014
133
0
10,680
Ok so i have a Seagate 1TB External hardrive which is 3.0 USB i have it plugged into my computer which is also 3.0 even though this wouldn't make a difference but i also tried it in 2.0. My system is:

XFX 650w PSU
WD 1TB Caviar Blue
Corsair vengeance pro series Ram
COrsair 300r case
Gigabyte H87-HD3 Motherboard
CM 212 evo CPU cooler
i5 4670 CPU
Samsung DVD-RW drive
1 SP Corsair Fan
6 AF Corsair fans

It literally acts like a power cut just straight off.

I have had this mainly plugged into the rear USB slots but have tried the front also. This HDD was working for a month or so with this computer the problem has only just come up now, The external HDD works fine on my other computer.

I have tried error checking the external drive, renamed the drive letter paths. Any ideas please?