If you remove the hard drive from the computer and convert it into a desktop hard drive you would have to go into the bios settings and change the boot-up order from dvd or hard drive to usb. Check first that your computer can actually BOOT from usb (look in the bios settings to see if this option is listed). Depending on the age of the computer you may not have the boot from usb option.
I don't use Mac. Never used one. However, I do use Linux. On a partitioned hard drive Linux can 'see' into Windows and you can transfer things from Windows into Linux. However, Windows can't 'see' into Linux at all. Windows knows that the linux partition is there but just can't access it. This is normal.
It would appear that your computer is more or less doing the same, for whatever reason, even though it was working fine a while ago.
Maybe Linux would be able to access the Mac side of things in your computer? I don't honestly know. But it would be able to access the Windows 7 side of things. Why not try a 4th partition with Linux on?
Linux Ubuntu is a free download. Download the image, burn it to dvd and then restart your computer. It will give you the option of either using the entire hard drive for installation, or putting it in its own partition. You can also install Ubuntu on a usb pen and boot your computer from that (if you have the boot from usb in your bios settings). More information and download is available at
http://www.cavalrystorage.com/download.aspxIt may be the actual usb port that is worn, not the cable. The front ports on my desktop are so worn as to be unuseable
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