Can't enter bios or boot an OS after bios update.

[Ben Evolent]

After installing a new gpu i wasn't able to access bios. The computer started with the splash screen and if i pressed del then it would go to a black screen with a glowing cursor and wouldn't accept any input. This problem would persist even if i switched the new graphics card with the old one. I found a solution online that said that a bios update would help with that. I performed the update using @Bios. Everything went smoothly during the installation but after i restarted my computer i still couldn't access bios(same as before) and on top of that the pc would stack on "Verifying DMI pool data......... AMD Data Change Update new data to DMI!".

I tried clearing the CMOS, Bios Auto Recovery and removing the battery+cable for 15 minutes to no avail.

Motherboard: Gigabyte MA790FXT-UD5P
CPU: Phenom II x4 965
GPU: New( Sapphire R9 Toxic 280x), old( Sapphire Radeon 4890 HD)
Power Supply: Crossair TX 750
RAM: DDR3 Dual Channel 1333 8gb
Bios version: F5 old F7 new from gigabytes website

Is my motherboard ruined?

 

[Ben Evolent]

I was able to boot to windows after flashing the bios again using a usb stick and selecting Hardrive from the boot menu. I still can't access bios though.