My iMac has not been booting up the disk lately. I would have to manuely boot it up by holding down the option button.

When ever I boot up my imac it cant find the disk automatically. I would have to restart the computer and hold down the option key to boot up the disk. How can I fix this problem?

Go to: Apple > System Preferences > Startup Disk and check to make sure that your Macintosh HD OS X,10.8.2 is selected as your startup disk.
If so and the problem persist..? Disconnect your other devices (hard drive, network drive, iPhone, iPad, even an iPod) one at a time to see if one of those is keeping it from starting up normally.

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