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Strange power issues

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Hello everyone. I have a Mac pro 4,1 (early 2009) that I recently upgraded from an 8 core 2.66GHz machine to an 8 core 2.93GHz machine. I have installed a Diamond Multimedia AMD Radeon HD 7870 graphics card from my old Windows PC and also installed 32gigs of DDR3 ECC Registered ram that I picked up on eBay.

Recently I have noticed that right after installing or changing a component, pressing the power button only causes a click sound but nothing happens. If I pull the power cable and...

Strange power issues

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