Cooling fan on OS X 10.7.5 runs at high all the time. Have tried SMC reset, putting it to sleep

Cooling fan on Mac desktop OS X 10.7.5 will not turn off. have tried resetting SMC, putting to sleep and force quit programs. Started after replacement of hard drive and LCD cable. Please help! Thanks!

Take it back to whom replaced it.
If you did it, you may need to take it in for service.    You have to be very careful how you put the pieces back together and neither put on too much cooling gel which would make it an insulator, and not too little.

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