I installed snow leopard in my old MacBook 2006 (late; intel, core2duo) in the replacement 500 GB WD hard drive after formatting it to Mac Extended Journaled. Installation was successful, however the screen is non-responsive and there is no "hard drive icon" in desktop (nothing works there except clock is running and I can move the cursor). I did the installation through SATA Adapter, so my old computer is still running fine now, but current hard drive is too old to rely on. I need to replace it soon for the data safety. Please note that I'm using OSX 10.6.8 now. Any guidance on the cause and solution is highly appreciated. Thanks.