I was trying to download Windows 7 on my old laptop and was getting help from my friend because hes done it over and over again. He told me that if i wanted to actually boot into the next part of the Windows 7 install i had to change to CSM Boot Mode. So i went into the BIOS and turned it on and it showed the whole "No boot disk detected, please insert your boot disk" spiel so i put in my windows 7 disk and realized that none of my drives are MBR and now i cant access the BIOS no matter what i do. Ive tried holding down F2 and ESC while it was booting up and nothing happened. I tried holding F2 and ESC while it was showing the whole "no boot disk detected" thing. Still nothing happened. I tried going into the cmd in the Windows 7 installation and i cant even get into it. At this point all i want to know is a way to get into the BIOS to change it back to UEFI mode.