I accidentally connected the "POWER SW" cable on my motherboard the wrong way while building my PC. Could this be why my motherboard isn't turning on? It was working perfectly fine before I made this mistake.
4 Answers
No worries, plugging in the power switch cable the wrong way shouldn't hurt your motherboard at all. It's just a switch that bridges those pins, so it doesn't have a polarity issue.
Flipping the polarity of the power switch wouldn’t cause damage; it simply means the button won't function. You might want to check other components for the actual problem.
Since you've mentioned vertical lines on your screen before, try removing your GPU and see if it works with just the integrated graphics. That could help you narrow down the issue.
Check if your power supply is working correctly. I had a similar issue where my power supply was faulty and it damaged my GPU and motherboard. Consider testing with a different PSU if you have one handy.

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