I have a ASUS P8H61-M LE/USB3 motherboard and I cant seem to open the bios when it boots up. Ive tried f2, f8, backspace, and delete key. When i boot up and the asus logo shows it it says to press the del key and i do, by pressing and tapping repeatedly but it doesnt work. The only time it showed progress was when i pressed f2, f8, backspace and delete together repeatedly, it made a short beep but just progressed into normal windows 10. I cant load it into uefi mode as it is a legacy bios. any help would be appreciated, thanks!