Help with Partitions in linux mint.
 

I had Windows 7, installed with Linux mint on my computer, but I liked Linux mint so much that I deleted Windows 7, thinking that I could increase the size of the partition on Linux mint. Now I have no way of resizing the partition, and I can't get any cd's to auto start on my computer. I don't know how to change the size of my now 30 GB mint partition, and add the extra 70+GB to it. GParted, and all of the other partitioning programs, seem to make you unmount whatever thing you're on, and i can't get any of the cd's I made to auto start on the computer, such as the original cd I used to install mint with. Thanks for you're help.

Yes, you are right. You can't change the size of the partition which you are using now. Get any live CD:
http://www.knoppix.net/ (for example)
Even better, you could mount the partitions for you data. Is that something you'd like to do?

BIOS Changed?
 

It is odd that you cannot boot from the CD you installed from. Hmmm...

Have your BIOS settings changed? Do you have, from cold boot, a boot manager? (I have Dell and Toshiba laptops and they have this feature.)

Regarding your partitions, are these Primary, Extended/Logical, a mix? How's about posting your partition table? Run the command below to put it to a text file and you could copy and paste it here.

$ sudo fdisk -l /dev/sda > part-table.txt

For more info on partitioning see:
http://forums.linuxmint.com/viewtopic.php?t=11872
http://forums.linuxmint.com/viewtopic.php?f=42&t=358
http://content.hccfl.edu/pollock/AUn...rtitioning.htm

My most recent and most successful partitioning was done using a modified version of Pollock's "Partitioning Map for 50 GB hard disk, FreeBSD, For a Home user's development workstation" on the third link. I did this for an installation of Debian GNU/Linux 5.0.3 KDE and noticed a somewhat significant increase in performance on an old laptop (30 GB HDD) that I use as MY main machine (I'm using the school laptop right now because I can). I modified it somewhat and added a couple of partitions so I could install Mint. I share swap (of course) and /home directories between distros with the /home sharing accomplished by unique user names (I use part of the distro name in the user name).