I am a first time builder, I have i5 3570K CPU and i bought a Shadow rock pro be-quiet 150w aftermarket cooler. Now it spins on start up but seems to stop soon after, its not in a case and i have only been browsing so nothing to taxing on the cpu is it just saving power because cooling isnt needed or should it be spiing all the time like the PSU fan???? Also when i put the thermal paste that came with it on it was so dry that i had a job smearing it on, is this normal also??? Would love some help, thanks alot people!!!