ASUS Laptop - Changed something in BIOS now it won't boot, black screen only.

As mentioned on the title, I have an ASUS A56C laptop, it was working well and yesterday my brother asked me to make him a bootable USB so I made one, tried to test it out on my laptop and it won't boot to the USB I made, so I went into BIOS tried to changed it to boot into the USB. I didn't managed to change it so I clicked "Set BIOS to default" and pressed F10 to save and exit. After that, my laptop won't boot correctly, I mean when I tried to turn it on, the fan works, CD rom was running (I tried to put in a windows CD), the light for charging the battery lights up. I have been doing some research online, and I have tried all I found: I unplugged everything, the HDD, the ram, I unplugged the CMOS battery which was located at the mainboard, I pressed the power button for 20 seconds, I leave it overnight, put everything back in, tried to turn in on, no luck. So, I am not able to get myself to the BIOS page at all, no able to do anything. Anyone can help?

 

you have to hold or repeatedly tap F2 while booting to get into bios.
if that doesn't work, try tapping or holding the Del key.

you should always be able to get into the bios, even if you do change settings

 

Did that already, still didn't change the fact that it's not booting up....

 

i dunno. Try plugging in a vga monitor and see if maybe it's not displaying on the laptop screen.

setting bios back to default should not f*** it up like this