New Seagate hard drive freezes MacBook Pro
Try resetting both the NV-RAM (P-RAM) but more importantly, the SMC Power Manager for your model, which can be looked up on Apple Support to be certain. It's usually: remove battery, unplug, hold down Power key for 10 seconds. 

Also try a Safe Boot. And repairing the hard disk from an external startup, so that Disk Utilities can fully repair. But the problem you describe usually indicates some kind of electrical glitch, which needs to be solved.