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crwdns2934241:0crwdne2934241:0 Tony DeFranco

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Black Screen At Startup, Chimes OK, External screen OK

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Hello. I replaced the power supply and hard drive to iMac recently. After the fix, the iMac boots to a black screen. I can here the chimes and if I hook up an external monitor, the screen shows on it. I reset PRAM. I don't see a faint image on the iMac, however. Any troubleshooting steps anyone can recommend or maybe you know the issue? Thanks in advance.

Tony

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iMac Intel 21.5" EMC 2496 (Edu)

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open