NVIDIA GT 740M Code 45

Hi. My graphics card is not being detected, device manager lists NVIDIA GT 740M as a hidden device (have to select show hidden devices to view it), upon going into the device properties it states this:
'Currently, this hardware device is not connected to the computer. (Code 45)
To fix this problem, reconnect this hardware device to the computer.'
I'm sure theres nothing wrong with the actual hardware as it's a fairly new system although I'm not ruling this out. I've tried the following: re-installing intel based chipset from HP, manually installing updated driver from nvidia, restoring to an earlier restore point, attempted to roll back the BIOS to F.56 I think - it said my system was incompatible (have no idea why) - attempted to install BIOS F.63 which flashes successfully but then upon restart it says restoring system BIOS, apparently in dxdiag.exe I'm on BIOS F.63 which is really confusing. I'm out of ideas now except for opening the system guts and checking if the hardware has come loose or something.
»HP ENVY TouchSmart 15-j024ea Notebook PC (ENERGY STAR)
Serial Number: (Personal information removed by Moderator)
Product Number: F1X65EA
Any help appreciated.

Hi @LaneyUK
I understand that your GT 740M is showing up as a hidden device with a device manager error code 45. I am happy to help you with this, however as it is such a new system, it may be best to call in to support and make use of your warranty, and avoid anything that could nullify that.
Please call our technical support at 800-474-6836. If you live outside the US/Canada Region, please click the link below to get the support number for your region.
http://www8.hp.com/us/en/contact-hp/ww-phone-assist.html
Malygris1
I work on behalf of HP
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Hi,
This is your same other question. No, physically impossble
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