Hello, can you pleased help me to fix my pc. the problem is that when i plug the 4 pin atx 12v power cable it has no power at all.
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You may have a short on the 4 pin connector or in one of the 4 pin power supply wires. I would try a different power supply first. Also be sure the cable isn't stretched putting pressure on the wires. This could cause a bad connection.
What mobo? Some won't post with a 4pin they require an 8pin atx 12v lead.