boot - Forgot password and can't access GRUB menu

I forgot my username and password so I can't log on.

I have seen how to load a recovery boot from the grub menu, but I can't access mine. It says press esc, but I've tried at least 50 million times and it just counts down from 2 and continues loading.

• I've tried holding it and pressing it repeatedly.


• I tried pressing shift (even though I have an older version where you press esc) and that didn't work either.


• I tried every other butt so many different times and ways with no success. I've also tried guessing my username and password (since I can't remember either) but to no avail.


• I also created a Windows 7 boot disc to try and change OS and just wipe my computer, but it doesn't work.

It just takes forever to read the disc and then ignores it and continues loading Ubuntu...

I HAVE NO IDEA WHAT TO DO AND I DON'T WANT TO HAVE TO BUY A NEW TOWER.

My big brother made me this computer but I have a laptop and didn't have space for both in my tiny dorm room. Now I have my own apartment and I NEED to use this.

Is there some way to wipe it externally?

There are no important or relative files since it's so old and I just want to use my computer again... is there anything I could do?