Imac won't boot after upgrade to latest Yosemite

After Upgrading to latest Yosemite version - my Imac will not start - it just hangs there or eventually comes with Crash window tellling it will restart.
However the Imac does launch in safe mode - holding down the shift key -but then there is no sound - so that no good.
Can you solve this you will be the christmas hero in Danish land.
NB sofar I have tried
reset PRAM- reinstalled Yosemite - Verified Disk is ok.
iMac (27”, ultimo 2009) - 2,66 GHz Intel Core i5
Yosemite 10.10.1 (14B25)
Latest crash log
nonymous UUID: 273AE997-AFAA-D71B-8080-9D38EA80ADEB
Sat Dec 27 19:52:13 2014
*** Panic Report ***
panic(cpu 1 caller 0xffffff800d01e80a): Kernel trap at 0xffffff800d1338c3, type 13=general protection, registers:
CR0: 0x0000000080010033, CR2: 0x000000010689fb25, CR3: 0x0000000124a97000, CR4: 0x0000000000002660
RAX: 0xffffff801aaa5df8, RBX: 0x00bfbfbf00bfbfbf, RCX: 0x0000000009000000, RDX: 0xffffff800d6f42d0
RSP: 0xffffff80a69bb460, RBP: 0xffffff80a69bb4b0, RSI: 0xffffff80a69bb507, RDI: 0xffffff800d6f42d0
R8: 0xffffffffffffffe9, R9: 0x000000000000003a, R10: 0xffffff8077cf3008, R11: 0x0000000000000000
R12: 0xffffff80a69bb4f0, R13: 0x0000000000000017, R14: 0x0000000000000017, R15: 0x000000000000031b
RFL: 0x0000000000010206, RIP: 0xffffff800d1338c3, CS: 0x0000000000000008, SS: 0x0000000000000010
Fault CR2: 0x000000010689fb25, Error code: 0x0000000000000000, Fault CPU: 0x1
Backtrace (CPU 1), Frame : Return Address
0xffffff80a00bde10 : 0xffffff800cf3a811
0xffffff80a00bde90 : 0xffffff800d01e80a
0xffffff80a00be050 : 0xffffff800d03a443
0xffffff80a00be070 : 0xffffff800d1338c3
0xffffff80a69bb4b0 : 0xffffff800d331348
0xffffff80a69bb5a0 : 0xffffff800d331d55
0xffffff80a69bb740 : 0xffffff800d32aab9
0xffffff80a69bb7d0 : 0xffffff800d340ccf
0xffffff80a69bb9a0 : 0xffffff800d13f2f8
0xffffff80a69bba80 : 0xffffff800d13ea95
0xffffff80a69bbbb0 : 0xffffff800d152005
0xffffff80a69bbc00 : 0xffffff800d15fcc7
0xffffff80a69bbf20 : 0xffffff800d154f0a
0xffffff80a69bbf50 : 0xffffff800d44dcb2
0xffffff80a69bbfb0 : 0xffffff800d03ac46
BSD process name corresponding to current thread: WindowServer
Mac OS version:
14B25
Kernel version:
Darwin Kernel Version 14.0.0: Fri Sep 19 00:26:44 PDT 2014; root:xnu-2782.1.97~2/RELEASE_X86_64
Kernel UUID: 89E10306-BC78-3A3B-955C-7C4922577E61
Kernel slide: 0x000000000cc00000
Kernel text base: 0xffffff800ce00000
__HIB text base: 0xffffff800cd00000
System model name: iMac11,1 (Mac-F2268DAE)
System uptime in nanoseconds: 88678398319
last loaded kext at 88213280354: com.apple.driver.AudioAUUC 1.70 (addr 0xffffff7f8f484000, size 28672)
loaded kexts:
com.apple.driver.AudioAUUC 1.70
com.apple.driver.AppleHDAHardwareConfigDriver 267.0
com.apple.driver.AGPM 100.14.37
com.apple.driver.AppleTyMCEDriver 1.0.2d2

Hello snake-apps,
Welcome to Apple Support Communities.
The article below provides troubleshooting tips that’ll help resolve kernel panic issues, like the one that you’re seeing with your iMac after upgrading to OS X Yosemite.
OS X: When your computer spontaneously restarts or displays "Your computer restarted because of a problem." - Apple Support
Ciao,
-Jason

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