I am facing problem with my laptop whenever I turn on my computer just after 2 hrs it showed blue screen error and got shut down. I have replaced my Hard-drive but the problem is still there. Sometimes it works fine for 4 or 5 hrs but sometimes it got shut down in 30 minutes and so. Blue screen come up and says hardware failure. Would you please help me with that? Do I need to replace the Hard-drive or is there anything other I need to pay attention for?