So I am working on a CD Macbook, about 4 months old I guess, over the last few weeks something very odd seems to be happening when I turn the thing on. But only sometimes.... So I hit the power button, and before the Grey Apple screen appears, another screen appears, which appears to be asking which Hard Disk I want to boot from... The problem being there is only one option to choose from (Macintosh HD). This appears as an icon of the HD with an arrow underneath. Click on the arrow, and the normal boot continues. There appears to be absolutely nothing wrong with the operation of the Macbook other than this. As I saw this only happens sometimes (I've tried numerous different configuration, e.g. mains power vs. Battery Power, CD/DVD inserted vs No CD/DVD inserted, repairing permissions). Often it just leaps straight to the Grey apple screen and the boot is entirely normal... It is a mite confusing! I've also checked Prefs>Startup Disk and there are two options to choose from: 'Mac OSX, 10.4.8 on Macintosh HD' (Selected), or 'Network Startup'. Whilst this isn't a problem (as I say all seems to be fine) it is confusing me. Any thoughts? Oh and apols for the long post, didn't want to miss any details!