Fans run at 6000RPM constantly and Function keys are misassigned

OK here's the story: I've got a 17" Core 2 Duo MBP that I replaced the top case (keeping the original keyboard) and hard drive in. Now the fans run at a constant 6000 RPM despite what I have Fan Control tell them to do. In addition, the function keys are misassigned - the keyboard is labeled with volume control on f3-f6 and keyboard brightness at f8-f10, but f10-f12 actually control volume and f5 and f6 control the screen brightness (it appears it still thinks I have the 110 key USB KB plugged in since it's following that layout).
I've tried resetting the SMC and applying the SMC firmware update with no luck (the firmware updater tells me I don't need it and I can't find a way to force it). There are no processes hogging CPU, and I've disabled indexing just to be sure. The fans will run at 2700 or so for the first few minutes, but as soon as the temp hits about 104F they go max and don't slow down until I shut it down or put it to sleep. I'm using a drive image from a black MacBook so I suspect my OS install is confused about what hardware is actually present, but before I do a clean wipe and restore I'd like to know if anyone has any other ideas. Thanks!

Welcome to Apple Discussions
The fans run at maximum if either a) the cable has been left off the temperature sensor or b) the sensor is bust - I'd guess you didn't remake the connection or it's come off during re-assembly.
+a drive image from a black MacBook+
That's a mistake, you should only install and use the OS that came on the install DVD with your MacBook Pro, there are significant differences in the software ...

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