My mac book pro login screen background wont show and only shows a light white/blue as the background how do i fix it ?

my mac book pro mountion lion system  login screen background wont show and only shows a light white/blue as the background how can i fix it ? i tried everything from loginox to onyx and it still wont solve the problem. instead of the default dark grey startup screen  the background is white with a blue tint to it. the only time that the default background shows is when i log off and relog in

Welcome to the Apple Support Communities
I think that your Mac detects your hard disk, but the problem is that your new hard disk doesn't contain any operating system, so your Mac doesn't find any bootable partition and you see a question mark.
If your Mac came with DVDs, insert the Mac OS X Install DVD and hold the C key while your Mac is starting. Then, just install Mac OS X. If the hard disk isn't prepared to install Mac OS X, you will have to erase it using "Mac OS Extended (Journaled)". See > http://pondini.org/OSX/DU1.html

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