IMac goes blank screen and freezes

Hi,
I got 24" iMac running OS X 10.5 and Win 7. Last night I was running windows playing some game when screen gone totaly black for unknown reason and iMac froze.
After that booting to OSX it caused grey screen just after a couple of seconds when the desktop has showed. Booting from recovery CD causes the same at the point when you see "Loading Apple" thingie.
I did extended apple hardware test and it showed nothing.
They only way for me to get online and post this message is getting Win7 into a safe mode or VGA mode without NVIDIA driver loaded. Btw when booting win7 normaly it goes black screen after the desktop loaded.
My warranty period has expired month ago. And last time contacting support about the hard drive issue was a real trouble. Im in Ukraine, Odessa. And this guys are in Kyiv.
So what should I do?

update:
OS X seems to be working in safe mode and, I got crash report after booting in normal
Interval Since Last Panic Report: 96 sec
Panics Since Last Report: 1
Anonymous UUID: 0DAB24C5-621E-4E50-BE00-170C9BCE23E2
Mon Mar 8 17:28:53 2010
panic(cpu 1 caller 0x00C706A4): NVRM[0]: Read Error 0x00088004: BAR0 0xe2000000 0x66417000 0x092480a2 D0 P2/4
Backtrace (CPU 1), Frame : Return Address (4 potential args on stack)
0x5b5132a8 : 0x12b4c6 (0x45f91c 0x5b5132dc 0x13355c 0x0)
0x5b5132f8 : 0xc706a4 (0xea0e80 0xea0e80 0xe656d4 0x0)
0x5b513358 : 0xf29afd (0x7b11804 0x7b1c004 0x88004 0xae7f0300)
0x5b5133a8 : 0xebaa82 (0x7b1c004 0x88004 0xae7f0300 0xebaa4f)
0x5b5133c8 : 0xf42bb5 (0x7b1c004 0x7b4bc04 0x4 0xae7f0300)
0x5b513448 : 0xf545f4 (0x7b1c004 0x7b04204 0x1 0xa)
0x5b513488 : 0xd720ce (0x7b1c004 0x6ff9004 0x0 0x0)
0x5b5134c8 : 0xd50f72 (0x6ff9004 0x2ee00 0x3 0x0)
0x5b513548 : 0xd50cfd (0x7b1c004 0x7d95a04 0x4 0x1)
0x5b513588 : 0xd39878 (0x7b1c004 0x7d95a04 0x0 0xafc8)
0x5b513678 : 0xd347a2 (0x7b1c004 0x7d93004 0x0 0x0)
0x5b5136b8 : 0xdce900 (0x7b1c004 0x7d93004 0x0 0x2)
0x5b5137d8 : 0xd531ee (0x7b1c004 0xc1d00021 0x1008000 0x20000107)
0x5b5138e8 : 0xcf6a29 (0x7b1c004 0x0 0xc1d00021 0x1008000)
0x5b513928 : 0xcf676d (0xc1d00021 0x1008000 0x20000107 0x736ac24)
0x5b513978 : 0xc7e6b9 (0xc1d00021 0x1008000 0x20000107 0x5b513c08)
Backtrace continues...
Kernel loadable modules in backtrace (with dependencies):
com.apple.nvidia.nv50hal(5.4.8)@0xeb6000->0x1109fff
dependency: com.apple.NVDAResman(5.4.8)@0xc57000
com.apple.NVDAResman(5.4.8)@0xc57000->0xeb5fff
dependency: com.apple.iokit.IONDRVSupport(1.7.3)@0xc49000
dependency: com.apple.iokit.IOPCIFamily(2.6)@0x5ce000
dependency: com.apple.iokit.IOGraphicsFamily(1.7.3)@0xc0f000
BSD process name corresponding to current thread: kernel_task
Mac OS version:
9L31a
Kernel version:
Darwin Kernel Version 9.8.0: Wed Jul 15 16:55:01 PDT 2009; root:xnu-1228.15.4~1/RELEASE_I386
System model name: iMac8,1 (Mac-F227BEC8)

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