I have the late 2011 unibody 17" macbook pro. I've been having an issue where when I close programs or even sometime on startup the computer locks up, sometimes a blue screen with flash for a moment. I can move the the mouse around but nothing is clickable and my batter icon disappears. I have been thinking that might be the hard drive that needs replacing. Do you all agree? Does anyone have a suggestion on brand or model of a hard drive? I have good luck with external western digitals and seagates.
If you are using your original install disk for Snow Leopard (10.6), hold the C key when starting the MBP. See if that will start the installation sequence. When you see a menu bar on top of the display, click on UTILITIES. From the drop down menu select Disk Utility and proceed to repair the disk.
If you start the MBP holding the OPTION key, it should display two HDD icons. Select the one on the rightt, the RECOVERY icon. That should display a 4 option menu. One of the options is Disk Utility. Select that one and proceed to repair the disk.