Mac won't start, gives me the kernel stop-sign

Ok, this is my big big problem..
One day, i was just doing nothing on my dear computer, starting up firefox or something, then suddenly everything stopped. I couldn't do anything. I forced-restarted the computer with the boot-button. When im trying to start it over again, i get to the white startup-screen with the apple-icon in the middle, with the loading-circle underneath it. After a while, the apple-icon changes to a grey stop sign (picture of it further down).
So, what have i tried?
Trying to boot with CD, says i can't install Mac OS, but i can go into the Disk utility, Verify Disk / Repair Disk:
Verifying volume "Macintosh HD"
Checking Journaled HFS Plus volume.
Invalid node structure
Invalid B-tree node size
Invalid node structure
Invalid B-tree node size
Volume check failed
Error: Filesystem verify or repair failed.
I have time machine on my external hdd, but when pressing the time machine-button after trying to start with CD, nothing happens.
When starting the computer holding down SHIFT-button, i get a white screen with black text, and a square saying 'You need to restart your computer. Hold down the Power button until it turns off, then press the Power button again." The black text in the foreground says:
panic(cpu 0 caller 0x560d25): "Unable to find driver for this platform: \"ACPI\".\n"@/SourceCache/xnu/xnu-1504.9.37/iokit/Kernel/IOPlatformExpert.cpp:1 389
Debugger called: <panic>
Backtrace (CPU 0), Frame: Return Address (4 potential args on stack)
0x508a3da8 : 0x21b510 (0x5d9514 0x508a3ddc 0x223978 0x0)
0x508a3*** : *and the same thing as the other one but with different numbers
0x508a3*** : *and the same thing as the other one but with different numbers
0x508a3*** : *and the same thing as the other one but with different numbers
0x508a3*** : *and the same thing as the other one but with different numbers
0x508a3*** : *and the same thing as the other one but with different numbers
0x508a3*** : *and the same thing as the other one but with different numbers
BSD process name corresponding to current thread: Unknown
Mac OS version:
Not yet set
Kernel version
Darwin Kernel Version 10.7.0: Sat Jan 29 15:17:16 PST 2011; root:xnu-1504.9.37~1/RELEASE_I386
System uptime in nanoseconds: 368530813
The Apple stop sign:
http://a248.e.akamai.net/7/248/51/1068051125396238/www.info.apple.com/images/kba se/106464/106464_1.gif
Ok, so i cant boot the computer with the shift key, just gives me bad error message. Nothing particular is happening while booting with the X-button and i've tried to reset PRAM.
I really don't know what to do... and my computer is from 2009, has worked pretty good (until now), and i dont have any warranty...
EDIT:
I've also tried to boot it with holding down cmd-s, and i just get a repeated message saying alot of stuff...
"rooting via boot-uuid from /chosen: ******* (alot of numbers and letters)
waitingon <dict ID="0"><key>IOProviderClass</key><stringID="1">IOResources</string><key>IOResou rceMatch</key><stringID"2>boot-uid-media</string></dict>
Got bootdevice =IOService:/AppleACPIPlatformExpert/PC10@0(AppleACPIPCI/SATA@B/AppleMCP79AHCI/P RT0@0/IOAHCIDevice@0/AppleAHCIDiskDriver/IOAHCIBlockStorageDevice/IOBlockStorage Drivers/ST9320423ASGMedia/IOGUIDPartitionScheme/Customer02
BSD root: disk0s2, major 14, minor 2
hfs_swap_BTNode: record ¤0 invalid offset (0x0031)
hfs: node=0 fileID=4 volume= device=root_device
hfs_mountroot failed: 5
cannot mount root, errno= 19"
Something like that.....

There is this Apple Knowledge Base article, which describes your issue:
http://support.apple.com/kb/TS1892?viewlocale=en_US
However, it sounds as though you have tried most of what's there. If it won't allow you to reinstall the OS, then there is definitely something amiss with your hard drive.
Sometimes a third-party disk utility (such as Drive Genius) can repair a drive when Apple's own Disk Utility cannot.
Good luck with it.

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