Im having a problem reverting to snow leopard through the usual tried and true methods.

i have a mid 2010 imac that originally came with osx 10.6. since i upgraded to mountain lion two years ago, ive been unable to use pro tools 9. i have about a terabyte of sessions and recordings that i need to reopen so i want to make a partition and install snow leopard there. i made the partition and flashed a legit copy of snow leopard 10.6 to a sandisk 16gb usb drive. the bootable drive shows up fine in my current install of yosemite, as does it show up when i restart and hold option to bring up the partitions and other media connected to the usb hub and superdrive. when i click on the bootable drive it goes to the grey apple logo and hangs indefinitely. thinking it may have been the usb drive itself i got a legit copy of 10.6 on disc and tried it in my superdrive. my superdrive however, like many 5 year old superdrives, is a bit fickle and plays certains discs and spits others out immediately, the snow leopard disc being the latter. i got an external disc drive to run the disc and it also popped up in yosemite and at the reboot after holding the option key down, just like the bootable usb drive. it too hangs on the grey apple logo indefinitely. my question is this: do you think that im having with my usb controller? every method ive tried so far is going through the usb ports on the rear of the imac. since i cant boot using the internal drive and i dont have another mac to use the Target Disk mode method, this is the only thing i can come up with. ive literally been trying to reinstall snow leopard since december 2013 without any luck. ANY help would be appreciated. thanks in advance!

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