There are no yellow tabs in my device manager. I updated all my drivers
to the latest ones when I reinstalled Windows 7 Pro 3 days ago. I ran both antivirus and MalwareBytes scan as I spoke to the HP customer service. Both came clean too. As i mentioned in my 1st post, I ran a 7 hour memtest which was clean and had no error. I will start tracking the temperature of my computer after this. I did not overclock my CPU at all. So, that leaves me with 3 things, safe boot, clean boot and test my harddrive at manufacture website. i am not sure how long will it take for it to have any freezing issue on safe boot/clean boot. Besides, I am student and I consistently take my laptop to school with me. So, it is pretty difficult for me to run it under safeboot or clean boot during the weekdays. The suitable time would be over the weekend.
Btw, how do i check if my PSU is working properly? Again, my battery is connected to my laptop when it crashed 2 hours ago and it had charge in it. So, do you think we could eliminate PSU problem this way?