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ASUS Rog G20CB issue, any help appreciated

CFCRick1986
Level 7
Have bought a Rog G20CB refurbished, previous owner gave it back to the shop as they thought it was a different model.

Specs are i7 6700
12GB DDR4 2133mhz, Nvidia GTX 950


Anyway tried booting it and it shows the ASUS splash screen with the words "Preparing Automatic Repair", and as soon as the white Windows 10 dots start to spin (to indicate it is loading) it freezes. I was also getting an occasional error code which said something to do with I/O device, then said file windows/system/winload.efi (i forget exactly) - HDD is fine as i hooked it up to my other desktop and it booted normal, but i installed a fresh Windows 10 anyway (made no difference)

Entered the BIOS on the G20 and my HDD and DVD drive were showing, and i know the HDD is fine anyway; and also they were listed under boot priorities. Tried booting from HDD, DVD with disc, bootable USB.

However, I then realised I only have the 230W power supply, and when I opened the case, next to the power adapter ports it says on the motherboard:

DC_IN (next to the 180 watt port)

DC_IN_GPU (next to the 230 watt port)

My question is this, am i failing to get past the ASUS splash screen and into windows because there is no 180W power adapter powering the HDD etc and the only power I have is going to the GPU really

Really stumped, thanks for your help

Rick
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