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I've got a late 2009 27" iMac with the AMD Radeon HD 4850. About six months ago my iMac would occasionally not wake up from sleep mode and I'd have to do a hard reset. As time when on this started happening more often. Then the screen started blinking black and would finally stay black and I would need to do a hard reset to get the iMac working again. Finally, even with a restart the screen would remain black. The iMac was still running in the background but the screen was blank. In Googling the issue I found that it is a common issue with the late 2009 iMac with the AMD Radeon HD 4850. All my research pointed to the video card being the issue. In doing some more research I came across this repair guide by James and decided to give it a try as I really had nothing to lose. I took my time and worked through the video several times. Long story short, once I got the system back together and started it up I had video again. This repair guide was a life saver for me. Thank you James!!!
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