If it does boot, then you can try clearing caches or removing third-party extensions that might be causing the problems. This should bypass the loading of unnecessary kernel extensions and hopefully allow the Mac to start up. If the computer still does not boot, try booting to Safe Mode by holding the Shift key when starting up. If you have multiple monitors, then unplug all but the main one, and try booting the Mac again. Remove all peripheral devices and all expansion cards. Therefore, the first thing to do is to strip the Mac down to its basic components. Sometimes interference from third-party hardware can cause odd boot problems, especially when the OS configuration changes. If this happens, there are a few steps you can take to try to clear the problem before taking the computer in for servicing: At other times, the system may not boot at all and show a blank screen even though the fans are spinning. Sometimes the system will hang at a specific boot screen such as the gray Apple, or at a blank blue screen. On rare occurrences people may find that after updating their Macs the system will not boot.
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