Blue screen, computer will not boot up

My computer, when powered up gets stuck on a blue screen and will not boot up. I have restarted & held down the shift button for safe mode & it goes to a white screen with a grey apple icon but will not move past this screen. How do I get the computer to boot up?

Sounds like your system is hosed. Try [repairing the hard drive with Disk Utility|http://support.apple.com/kb/TS1417]. Of course, from the sounds of it, even if you get the drive repaired, it may not fix the problems with your system.
Do you have backups? If not, your only priority at the moment should be to figure out how to back up your data, or what data may still be intact if your drive is badly damaged. If you have another Mac, the easiest way to do this will be to boot the machine into [FireWire target mode|http://support.apple.com/kb/HT1661] and copy whatever data you can.

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    Bug Check 0x50: PAGE_FAULT_IN_NONPAGED_AREA
    SYMEFA.SYS is a Symantec driver. If you have any Symantec/Norton products, I suggest you remove them. It's necessary to tear them out by the roots using their tool
       Download and run the Norton Removal Tool to uninstall your Norton product
    Microsoft's AV works just fine.
       Security Essentials.
    ==================================================
    Dump File         : Mini081910-20.dmp
    Crash Time        : 8/19/2010 1:46:17 PM
    Bug Check String  : PAGE_FAULT_IN_NONPAGED_AREA
    Bug Check Code    : 0x00000050
    Parameter 1       : 0xbff59c01
    Parameter 2       : 0x00000000
    Parameter 3       : 0x837505ba
    Parameter 4       : 0x00000000
    Caused By Driver  : SYMEFA.SYS
    Caused By Address : SYMEFA.SYS+103b
    File Description  :
    Product Name      :
    Company           :
    File Version      :
    Processor         : 32-bit
    Computer Name     :
    Full Path         : C:\Test\Mini081910-20.dmp
    Processors Count  : 2
    Major Version     : 15
    Minor Version     : 6002
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    Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
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