Grey screen for no reason

Hi,
I noticed since few days that the grey screen asking e to reboot appeared few times.
I didn't install any new software or RAM neither.
I have the following report :
Thu Aug 28 14:15:24 2008
panic(cpu 0 caller 0x00223363): "rtunref: bad refcnt 0 for rt=0x2e1bc90\n"@/SourceCache/xnu/xnu-1228.5.20/bsd/net/route.c:460
Backtrace, Format - Frame : Return Address (4 potential args on stack)
0x1b5fbdc8 : 0x12b0fa (0x4592a4 0x1b5fbdfc 0x133243 0x0)
0x1b5fbe18 : 0x223363 (0x471d78 0x0 0x2e1bc90 0x1a236f)
0x1b5fbe38 : 0x223857 (0x2e1bc90 0x1 0x0 0x0)
0x1b5fbe68 : 0x224b03 (0x2e1bc90 0x2 0x1b5fbe98 0x2c5c178)
0x1b5fbe88 : 0x273d5c (0x2e1bc90 0xffff 0x1 0x3a938a)
0x1b5fbeb8 : 0x24ae8c (0x2c5c178 0x2c4d640 0x1b5fbf28 0x19d9da)
0x1b5fbf18 : 0x24cd61 (0x2c5c258 0x2 0x1 0x24ebe6)
0x1b5fbf58 : 0x39aa01 (0x2c4d850 0x23ac6253 0x1b5fbf78 0x1a236f)
0x1b5fbf78 : 0x13eb1d (0x0 0x0 0x0 0xbfffe7b0)
0x1b5fbfc8 : 0x19ebdc (0x0 0x0 0x1a20b5 0x3456998)
Backtrace terminated-invalid frame pointer 0
BSD process name corresponding to current thread: kernel_task
Mac OS version:
9E17
Kernel version:
Darwin Kernel Version 9.4.0: Mon Jun 9 19:30:53 PDT 2008; root:xnu-1228.5.20~1/RELEASE_I386
System model name: iMac8,1 (Mac-F226BEC8)
Does anyone knows what its the problem?
Thanks in advance

In these situations the first step would be start the computer from the CD that came with it, by putting the CD in the slot and holding down the C key as the computer starts up. This will be a lot slower than normal, because you're starting off a CD and not a proper disk drive.
Once the computer has started, look for Disk Utilities (DO NOT choose the option of installing the system software - Apple has organised these disks in a very confusing way). In Disk Utilities, check and fix your hard drive, and repair permissions, then try once more to start up (not from the CD this time).
That's always the first thing to do. If it doesn't work....come back.

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