hitting delete will get you into BIOS
beside that, that's not the proper way fixing things (in this case - disabling a graphic card), meaning the laptop should work as intended from the manufacturer !!!!!
Anyway try, if you get it never mind !!!!!
----------------------------------------------------------STEP 1
- Can you go to your Control Panel -> System -> Device Manager -> Display adapters (How many graphic cards are there ???)
- Second if you see a Nvidia GeForce GTX 770M ( right click with your mouse and choose properties -> Panel Details -> [Property pull down menu] choose Hardware IDs (right the first Value here in this forum) ***
*** looks like this (PCI\VEN_10DE&DEV_11C0&SUBSYS_11C010B0&REV_A1)
if we are sure you have a GTX 770M card then we should go to the next step
-----------------------------------------------------------STEP 2
I would suggest you uninstalling all graphics adapter (Intel + Nvidia )
Cleaning your registry with Ccleaner (http://www.filehippo.com/download_ccleaner)
Intel Drivers:
Windows 8 64 bit: https://downloadcenter.intel.com/Detail_Desc.aspx?agr=Y&DwnldID=22842&lang=eng
Windows 8 32 bit: https://downloadcenter.intel.com/Detail_Desc.aspx?agr=Y&DwnldID=22840&lang=eng
Nvidia Drivers:
Nvidia Laptop drivers 64 Bit: http://www.geforce.com/drivers/results/63462
Nvidia Laptop drivers 32 Bit: http://www.geforce.com/drivers/results/63461
As you can see from the Nvidia download side:
Supported Products GeForce 700M Series (Notebooks)
GeForce GTX 780M, GeForce GTX 770M, GeForce GTX 765M, GeForce GTX 760M, GeForce GT 750M, GeForce GT 745M, GeForce GT 740M, GeForce GT 735M, GeForce GT 730M, GeForce GT 720M, GeForce 710M
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Wish you good luck !!!!!