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kadlover1

macrumors newbie
Original poster
May 27, 2020
5
0
Hi my Mac is a mid 2007 model which I still enjoy using. I have opened it up a couple of times to replace Hard Drive and graphics card and everything worked well. Several days ago I replaced the CPU with a T9300 chip in order to be able to upgrade OS from El Capitan. After turning on sounded like booted up but no image at all just black. The first 3 Test LEDs light up not the fourth. I replaced the CPU chip back with original and same result. Seems odd as everything was working previously. Does anyone have ideas. Thanks
 
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