My Macbook has been freezing or crashing since I replaced the hard drive and restored my applications and files using Time Machine. Software diagnostics and repairs do not seem to indicate any problems on the software side (SmartUtility, Yasu). Is it possible that faulty hard disk could cause this sort of trouble, or would hardware problems lead to more catastrophic (and obvious) failures?
Edit (details): This replacement was just to increase my hard disk space, so no problems before. The freezing is the spinning beach ball or just pauses. The crashes are not whole OS crashes but many applications just fail to respond or access information. Rebooting seems to fix. This hadn't happened to me before the HD replacement, so this is why I suspect the HD. Thanks for your inputs.