(M17x)Can not see my main video card on the device manager list after depot repair.

i had a screen problem before they sent tech to replace LCD motherboard and it didnt fix the problem.

so i had to send my laptop back (M17x) to repair.

i got it back few days ago and having no problems with screen anymore

but i found out that when i play games it get so laggy and barely can run high performance,

so i check the device manager list and saw only 1 video card is shown on the list, which is my back up video card Geforce 9400M

i check  my Fallout3 video adapter option and see only Geforce 9400M is on the list too.

i am curious where did my main video card go ? the Dual GTX 280M is not on the list nor the device manager list. 

i think they might have replace a new video card for me during the depot repair, or did they forgot to put my main video card back in ?

help me pls, thanks