Bios Recovery Help Wanted

[bump98]

I have an HP dv6z-3000 CTO Special Edition. I flashed a modded BIOS (F29) to give advanced menu and remove whitelist. This worked however I changed the GPU to external PEG and restarted. Now I get black screen. The keyboard lights but the control lock key flashes 5 times then pauses and does it again, over and over. I have searched every forum I could find. I have tried every bios recovery method I could find but using the windows key and b does not do anything (set up various USB recovery methods). Is there any hope of recovery? Any assistance would be great.