Can't upgrade 2010 27" iMac to Yosemite

Hi all-- i'm at my wits' ends here. I have a 2010 27" iMac with 12GB of RAM. I've been trying to install Yosemite for a week now. (It runs 10.9.5 perfectly.) Whenever I try to upgrade, the iMac restarts and gets to the gray screen with the apple. It then just locks at the progress bar at 50% or so. Sometimes it kernel panics and restarts. I have tried resetting the PRAM/SMC, reformatted drive (I installed a new one, in fact!) and used cmd-R to run disk utility (disk is fine.) Tried deleting boot caches, and that just drops me back into 10.9.5. I honestly don't know what to do at this point. Could it be faulty RAM modules? I got them when I was in Pakistan, and it's not an even number -- 12GB, as I mentioned. Anyone have any ideas?
Many thanks,
Chris

Here's the RAM data:
Memory Slots:
ECC: Disabled
Upgradeable Memory: Yes
BANK 0/DIMM0:
Size: 2 GB
Type: DDR3
Speed: 1333 MHz
Status: OK
Manufacturer: 0x80CE
Part Number: 0x4D34373142353637334648302D4348392020
Serial Number: 0x843FBBEF
BANK 1/DIMM0:
Size: 2 GB
Type: DDR3
Speed: 1333 MHz
Status: OK
Manufacturer: 0x80CE
Part Number: 0x4D34373142353637334648302D4348392020
Serial Number: 0x843FBBF2
BANK 0/DIMM1:
Size: 4 GB
Type: DDR3
Speed: 1333 MHz
Status: OK
Manufacturer: 0x80AD
Part Number: 0x484D54333531533642465238432D48392020
Serial Number: -
BANK 1/DIMM1:
Size: 4 GB
Type: DDR3
Speed: 1333 MHz
Status: OK
Manufacturer: 0x80AD
Part Number: 0x484D54333531533642465238432D48392020
Serial Number: -

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