hi,
need some help..

1) sometime i get a "GRAY Screen Box" saying that i need to reboot my system.
i get this when i open one or more then three apps at the sametime or when try to play dvd player.

2) when i run DPCI manager, it tell me that ATI Technologies Error_unknow Device. from the list.

i think that the os crash sometime because i hive no way to control fan on the ATI HD 5770 card, it gets very hot...

so this is what i got:
in graphic=ATI HD 5770 , "about this mac"

ATI Radeon HD 5000:

Chipset Model: ATI Radeon HD 5000
Type: GPU
Bus: PCIe
PCIe Lane Width: x16
VRAM (Total): 1024 MB
Vendor: ATI (0x1002)
Device ID: 0x68b8
Revision ID: 0x0000
Displays:
G215H:
Resolution: 1920 x 1080 @ 60 Hz
Pixel Depth: 32-Bit Color (ARGB8888)
Display Serial Number: LJ90D0028511
Main Display: Yes
Mirror: Off
Online: Yes
Rotation: Supported
Display Connector:
Status: No Display Connected
Display Connector:
Status: No Display Connected

but no graphice support.,

Lion:
Hardware Overview:

Model Name: Mac Pro
Model Identifier: MacPro3,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 2.67 GHz
Number of Processors: 1
Total Number of Cores: 4
L2 Cache: 12 MB
Memory: 6 GB
Bus Speed: 1.33 GHz
Boot ROM Version: MP31.006C.B05
SMC Version (system): 1.30f3
Serial Number (system): SOMESRLNMBR
Hardware UUID: DB61970C-3731-53E7-AC72-A26C06F00AAB

help....
thanks all

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Asus Rampage Extreme x48 / intel Q9450/ OC 4.0Ghz 4core
Corsair GT /6GB/DDR3 1603mhz/
Mac Radeon ATI HD-5770/1GB/
Lion 10.7.3 120GB SSD/ Mountain Lion 10.8 250GB SSD
Logitech HD-c905 webcam
Apple keyboard bluetooth+mouse bluetooth
Acer 24" HD Screen/ Fillwater cooling system