2011 21.5" iMac, installed SSD, constant fans, no HDD temp sensor

Hello,
I've recently installed a Crucial M500 512 GB SSD into my 21.5" 2011 iMac. I've done this to quite a few iMacs, and am well aware that some have a temperature sensor on the factory-installed hard drive. This one, however, did not, and now that the SSD is installed, I'm getting constantly running fans.
The fans run whether it's booted from the internal SSD, an external FireWire HD, or even if it's sitting in Target Disk Mode or on the Boot Options screen, so I feel like it's hardware-related.
Has anyone seen this before?

I should also note that I have reset the PRAM and SMC to no avail. Also the system seems to have totally crashed and now if I try to boot from the SSD, I get the prohibited sign, but it will boot from the recovery partition. Running Disk Utility on the SSD from the recovery partition gives no errors.

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