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ATI Radeon HD 4870 - Black screen and Fans go crazy!
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Dedicated MacNNer
Join Date: Jan 2008
Status:
Offline
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I decided to upgrade my graphics card to the ATI Radeon HD 4870 (i also purchased a new Apple Display and hooked it up via the Mini DisplayPort).
I've used the computer for a few days now and everything seemed to be working fine. But 3 nights ago my screen turned black and the fans in the computer went crazy. I was forced to hold down the power button and reboot. It happened again this morning.
Has anyone else had trouble with this graphics card? or a simlar experience?
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MAC PRO: Two 3.2GHz Quad-Core Intel Xeon 5400 processors
ATI Radeon HD 4870 with 512MB of GDDR5 memory
1600MHz, 64-bit dual independent frontside bus
16 Gigs (4x4) of 800MHz DDR2 memory
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Fresh-Faced Recruit
Join Date: Jun 2010
Status:
Offline
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I have the exact problem as you. I also have a ATI Radeon 4870, and I built a new gaming rig, but every time I boot up, the screen will go black and the fans go crazy and I will have to restart the computer three or four times before it stays stable until the next boot up.
I didn't know what was wrong with it, as I built it and there could be any number of problems, but since you have the same problem and graphics card, that seems to be the issue. 
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Clinically Insane
Join Date: Oct 2000
Location: Los Angeles
Status:
Offline
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Sounds like a nasty graphics card driver bug.
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"The natural progress of things is for liberty to yield and government to gain ground." TJ
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Professional Poster
Join Date: Mar 2003
Location: Down by the river
Status:
Offline
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When I saw "fans go crazy" I thought of cheering  Need more coffee...
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