I did as you asked Linc and I worked about 5min. in the guest account before the first hang. I am still in safe mode but again as I opened several .apps I got my first hang as i opened text edit. I have never enabled file vault and literally don't know what 'find my Mac' is- but I did buy the machine slightly used about a year and a half ago from a guy who set it up for a family PC user who just couldn't make the switch (!?). Following some lines from console as I started up in safe mode.
2/10/13 9:09:14.825 PM locationd[206]: NOTICE,Location icon should now be in state 0
2/10/13 9:09:15.651 PM mds[34]: (Warning) Server: No stores registered for metascope "kMDQueryScopeComputer"
2/10/13 9:09:15.692 PM mds[34]: (Warning) Server: No stores registered for metascope "kMDQueryScopeComputer"
2/10/13 9:09:29.334 PM firefox[209]: invalid pixel format
2/10/13 9:09:29.335 PM firefox[209]: invalid context
2/10/13 9:09:29.335 PM firefox[209]: invalid pixel format
2/10/13 9:09:29.336 PM firefox[209]: invalid context
2/10/13 9:09:30.178 PM WindowServer[114]: CGXDisableUpdate: UI updates were forcibly disabled by application "Firefox" for over 1.00 seconds. Server has re-enabled them.
2/10/13 9:09:30.349 PM WindowServer[114]: reenable_update_for_connection: UI updates were finally reenabled by application "Firefox" after 1.17 seconds (server forcibly re-enabled them after 1.00 seconds)
2/10/13 9:10:14.849 PM com.apple.kextd[11]: Can't load /System/Library/Extensions/cddafs.kext - ineligible during safe boot.
2/10/13 9:10:14.857 PM diskarbitrationd[48]: unable to mount /dev/disk4 (status code 0xFFFFFFFC).
2/10/13 9:12:01.087 PM xpcd[198]: (null): have symlinks: (
)
2/10/13 9:12:04.848 PM com.apple.security.pboxd[241]: Bug: 12C60: liblaunch.dylib + 23849 [2F71CAF8-6524-329E-AC56-C506658B4C0C]: 0x25
2/10/13 9:12:05.043 PM com.apple.security.pboxd[241]: CGSGetWindowTags: Invalid window 0x52
2/10/13 9:12:05.043 PM com.apple.security.pboxd[241]: kCGErrorFailure: CGSSetHideOnDeact: error getting window tags
2/10/13 9:12:05.876 PM librariand[239]: MMe quota status changed: under quota
2/10/13 9:12:06.556 PM WindowServer[114]: _CGXSetWindowHasMainAppearance: Operation on a window 0x53 requiring rights kCGSWindowRightOwner by caller TextEdit
2/10/13 9:12:06.642 PM com.apple.security.pboxd[241]: CGSCopyWindowColorSpace: Invalid window 0x52
2/10/13 9:13:42.480 PM talagent[152]: PersistentUI: CSBackupSetItemExcluded() failed with OSStatus -61
2/10/13 9:14:00.618 PM WindowServer[114]: _CGXSetWindowHasMainAppearance: Operation on a window 0x53 requiring rights kCGSWindowRightOwner by caller TextEdit
2/10/13 9:14:00.680 PM Activity Monitor[232]: Error communicating with activitymonitord - ipcErr = 100032
2/10/13 9:14:00.739 PM com.apple.security.pboxd[241]: CGSReleaseWindow: Invalid window 82
2/10/13 9:14:00.740 PM com.apple.security.pboxd[241]: _NXTermWindow: error releasing window (1000)
2/10/13 9:14:00.796 PM com.apple.launchd[1]: (com.apple.ActivityMonitor[234]) Exited abnormally: Alarm clock: 14
2/10/13 9:14:46.272 PM com.apple.kextd[11]: Cache file /System/Library/Caches/com.apple.kext.caches/Startup/KextPropertyValues_OSBundl eHelper_x86_64.plist.gz is out of date; not using.
2/10/13 9:14:46.274 PM com.apple.kextd[11]: Rescanning kernel extensions.
2/10/13 9:14:47.141 PM com.apple.kextd[11]: Can't load /System/Library/Extensions/Seagate Storage Driver.kext - no code for running kernel's architecture.
2/10/13 9:14:47.000 PM kernel[0]: Resetting IOCatalogue.
2/10/13 9:14:47.144 PM com.apple.kextd[11]: Load com.seagate.driver.PowSecDriverCore failed; removing personalities from kernel.
2/10/13 9:14:47.149 PM com.apple.kextd[11]: Can't load /System/Library/Extensions/AppleTyMCEDriver.kext - ineligible during safe boot.
2/10/13 9:14:47.152 PM com.apple.kextd[11]: Load com.apple.driver.AppleTyMCEDriver failed; removing personalities from kernel.
2/10/13 9:14:47.156 PM com.apple.kextd[11]: Can't load /System/Library/Extensions/AppleSMBusPCI.kext - ineligible during safe boot.
2/10/13 9:14:47.159 PM com.apple.kextd[11]: Load com.apple.driver.AppleSMBusPCI failed; removing personalities from kernel.
2/10/13 9:14:47.202 PM com.apple.kextd[11]: Can't load /System/Library/Extensions/GeForce.kext - ineligible during safe boot.
2/10/13 9:14:47.208 PM com.apple.kextd[11]: Load com.apple.GeForce failed; removing personalities from kernel.
2/10/13 9:14:47.252 PM com.apple.kextd[11]: Can't load /System/Library/Extensions/AppleHDA.kext/Contents/PlugIns/AppleHDAController.ke xt - ineligible during safe boot.
2/10/13 9:14:47.263 PM com.apple.kextd[11]: Load com.apple.driver.AppleHDAController failed; removing personalities from kernel.
2/10/13 9:14:47.292 PM com.apple.kextd[11]: Can't load /System/Library/Extensions/AppleMCCSControl.kext - ineligible during safe boot.
2/10/13 9:14:47.297 PM com.apple.kextd[11]: Load com.apple.driver.AppleMCCSControl failed; removing personalities from kernel.
2/10/13 9:14:47.302 PM com.apple.kextd[11]: Can't load /System/Library/Extensions/ApplePlatformEnabler.kext - ineligible during safe boot.
2/10/13 9:14:47.307 PM com.apple.kextd[11]: Load com.apple.driver.ApplePlatformEnabler failed; removing personalities from kernel.
2/10/13 9:14:47.319 PM com.apple.kextd[11]: Can't load /System/Library/Extensions/IOBluetoothFamily.kext/Contents/PlugIns/IOBluetoothS erialManager.kext - ineligible during safe boot.
2/10/13 9:14:47.323 PM com.apple.kextd[11]: Load com.apple.iokit.IOBluetoothSerialManager failed; removing personalities from kernel.
2/10/13 9:14:47.328 PM com.apple.kextd[11]: Can't load /System/Library/Extensions/IOFireWireIP.kext - ineligible during safe boot.
2/10/13 9:14:47.332 PM com.apple.kextd[11]: Load com.apple.iokit.IOFireWireIP failed; removing personalities from kernel.
2/10/13 9:14:47.338 PM com.apple.kextd[11]: Can't load /System/Library/Extensions/AppleUpstreamUserClient.kext - ineligible during safe boot.
2/10/13 9:14:47.341 PM com.apple.kextd[11]: Load com.apple.driver.AppleUpstreamUserClient failed; removing personalities from kernel.
2/10/13 9:14:47.346 PM com.apple.kextd[11]: Can't load /System/Library/Extensions/IOUserEthernet.kext - ineligible during safe boot.
2/10/13 9:14:47.351 PM com.apple.kextd[11]: Load com.apple.iokit.IOUserEthernet failed; removing personalities from kernel.
2/10/13 9:14:49.149 PM com.apple.kextcache[244]: rebuilding /System/Library/Caches/com.apple.kext.caches/Startup/kernelcache
2/10/13 9:14:55.858 PM com.apple.kextcache[249]: / locked; waiting for lock.
2/10/13 9:15:20.040 PM com.apple.kextcache[246]: Created prelinked kernel //System/Library/Caches/com.apple.kext.caches/Startup/kernelcache.
2/10/13 9:15:20.072 PM com.apple.kextcache[244]: /: no supported helper partitions to update.
2/10/13 9:15:20.073 PM com.apple.kextcache[249]: Lock acquired; proceeding.
2/10/13 9:15:20.079 PM com.apple.kextcache[249]: /: no supported helper partitions to update.
It all looks very ominous to me! đ