Originally I had Windows 7 on my Fujitsu AH532/G21 laptop. I recently installed Ubuntu 15.10, it worked just fine. Then I wanted to try out mint, but it gave me the error both in the normal boot and the recovery mode.

Upon typing the command I get I can't boot from any USB or CD. The only option I get in the boot menu is "ubuntu", and I can't access bios setup to change the boot order. Previously, I could boot from USB and access bios setup.

After long hours of research and trial and error, I've come to the conclusion that the only thing I can modify is the command prompt in GRUB 2.

I am new on these things and I would appreciate easily understandable instructions. thanks

try out, as in live cd/usb?
your ubuntu install still works?
in that case i'd say something went wrong when you created the bootable live medium.

I deleted ubuntu to install mint, but the program I used to prepare the usb was Unetbootin (so I guess that was a live usb?)
The ubuntu install doesn't work.

After you downloaded the Mint iso, did you do an md5 checksum to verify the download? Did you get any warning/error messages while using unetbootin to create the bootable usb? Do you have another computer on which you can try to boot the Mint usb to eliminate that as a possible problem?

Why exactly did you "delete" Ubuntu if it was working and you just wanted to "try Mint"? Obviously, you could try it from the Live USB.
The inability to access the BIOS has nothing to do with any operating system you might have on a flash drive, hard drive or DVD?
Also, at what point do you get the kernel panic message, the usb or the install on the hard drive?

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1) I don't know what that is :/ 2) I didn't get any error messages in unetbootin. 3) I have another computer, but I wiped out the usb after this error happened, to use bootrepair but it didn't work as well. Currently I have Ubuntu 15.10 in the usb. The other laptop recognizes it just well, but in the problematic laptop it doesn't show up at all. 4) I didn't find ubuntu very suitable for me so it was more of a transition. 5) Yeah, the BIOS is separate from all that but it's a part of the problem as I can't boot from any usb or cd.

When I turn on the computer the grub menu shows up. there are two options. Upon selecting the first option I get the error Nothing happens when I press any button.

In the second option I get two more options: All the options give 0x5cdad0 error but only the recovery mode advances to kernel panic. there are all sorts of things written on the screen at this point. I can post a screenshot if it helps.

Access BIOS:
[1]

Displayed or not, does F2 get you into the BIOS?
Do you hear the POST beeps (Power-On Self Test)?
Press F2 just after POST and see what happens.
From there you should be able to set your boot order to include DVD/USB or other external devices.
"Legacy USB Support" should be enabled says [1] and the default is Enabled.

The Boot Menu can also be invoked by pressing the [F12] key when the Fujitsu logo appears on the screen.
says [1]
Insert USB device prior to (re)boot and press F12 immediately after POST. This may take a couple of keypresses, but
usually one or two is sufficient to get to a boot menu (this boot menu not grub[2]).

IF you are finally able to boot the Mint bootable medium:
Should be an option to "boot from the hard drive", (or similarly worded). Try that.
If that works, you can try these instructions:
If there are no errors on the grub-install,
reboot the system w\out the USB and see what happens.

Please let us know.

No post beep when I boot. 1 second of fujitsu screen, then the grub2 menu opens. However, I hear post beep when I press F2, no bios setup shows, it just goes directly to grub2 menu. When I press F12, I hear post beep then get into the broken boot menu. I can't access the bios setup utility in any way, it seems. Also, in the diagnostic screen i can see my usb whenever it's plugged in.

You have to press F2 or F12 after the post beep.

There is no post beep unless I press F2 or F12. When the laptop boots, it just goes to the grub menu.

ouch.

Are you sure the USB is bootable?

Yes. It works in another laptop.

That's not grub/grub2.
Unless someone here knows that system intimately, I'd say you may have to contact the Manufacturer.

compatibility guide to running Linux with the Fujitsu LifeBook AH532 laptop
says " Tested in Ubuntu 12.04" and "This is an UEFI system"

There are other comments. Some indicate this is a very troubled system to get Linux onto.

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Thanks anyway...

You are welcome.
Sorry, it didn't work out.

i think herein lies the key to solve your problem.