Not bootable after replace superdrive

[klucy0914]

Happy Holiday, everyone!

After I replace my super drive with Hitachi 500G 2.5mm HDD, I can not boot except I hold the option key and manually selecting OS X to boot.

I think if I am able to reset HDD as 1st boot device as HDD like modifing BIOS in windows machine, it might help, how I don't know how.

Does anyone have same problem and know how to fix it?

Thanks!

klucy

 

[Kyffin]

Have you looked at System Preferences>Startup Disk and selecting the disk with the OS on it? Might be worth a look...