Changed legacy boot to UEFI boot... System doesn't boot

[razer26]

I just installed windows 8.1 on my pc with an intel dz77bh-55k board. It works, there is no problem with the installation. I was messing around with the BIOS to turn off the auto usb boot feature and turned on the UEFI mode from the Legacy boot mode. Now my pc is blank when I boot it. Even the Intel motherboard logo doesnot show up. When I switch it on, my monitor goes full black but my keyboard might be working (I'm not sure, but the num lock turns on and off). I've tried removing the cmos battery leaving it for 3 hours without power and rebooting but the same thing happens. Any idea what is going on or how to fix it?

Full system specs: board intel dz77bh-55k, hard drive Toshiba 500gb, cpu: i5 3570, ram: 4gb, os: windows 8.1 64 bit ( just installed)

 

[Calvin7]

The 3-pin jumper block determines the BIOS Setup program’s mode. (Note that this Configure mode is the only way to clear the BIOS/CMOS settings.)

Function/Mode Jumper Setting Configuration
•Normal 1-2 The BIOS uses current configuration information and passwords for booting.
•Configure 2-3 After the POST runs, Setup runs automatically. The maintenance menu is displayed. Note that this Configure mode is the only way to clear the BIOS/CMOS settings. Press F9 (restore defaults) while in Configure mode to restore the BIOS/CMOS settings to their default values.

Do not move the jumper with the power on. Always turn off the power and unplug the power cord from the computer before changing a jumper setting. Otherwise, the board could be damaged.