Gigabyte ga-78lmt-usb3 6.0 giving me tons of problems

[opeaina]

Ok so im having tons of problems with the Gigabyte ga-78lmt-usb3 (rev. 6.0) motherboard.
The problems are
1. I cant access BIOS, like when i click the Delete button, nothing happens.

2. I am upgrading my amd r5 230 to a Nvidia GT 740 SC and i deleted all my old drivers. but when i put it in my motherboard and plug in the 6 pin, the graphics card turns on and the fans work and stuff but when i plug in my vga to dvi cable, it doesnt show any picture. Then when i put in the old one and plug everything in it shows picture.
[strike]
3. I need help to update my BIOS[/strike] UPDATE: I checked and i have the most recent version of Bios

My specs are
Motherboard: Gigabyte GA-78LMT-USB3
Proccesor: AMD FX-4300 3.8 GHz
Graphics Card: Amd r5 230 1Gb/ Nvidia GT 740 SC
Storage: 1 TB SATA II 7200 RPM
Ram: 7gb DDR3 1600
Power: EVGA - 80 PLUS 600W

 

[clutchc]

First, let's work with the old gxf card and see if we can get you to BIOS. As soon as you turn on the PC (before there's even a display or the keyboard lights up), start tapping the DEL key rapidly. Like twice a second. Keep tapping. Sometimes the board's BIOS has the key check set too short.