Graphics card issue at boot

[Morose7]

Hey guys, i've installed a new graphics card a geforce 8 series see here: http://www.ebuyer.com/product/221443

its a PALIT 8400GS 256MB

Altered the EFI in the EFI studio, to the card and now I cannot boot

I tried booting normally and I get:





How do I rectify this without reinstalling the system?