My PC (Asus M2N-E M/B with on board 7.1 sound card) has 3 audio jacks that are connected to a 7.1 Yamaha receiver. The other day I was performing some routine maintenance on the PC and unknowingly subjected these jacks to upward tension. When I booted up the computer it would shut down within a few seconds. At the time, I had no idea what was causing this and I tried many things to remedy this problem without success. When I pulled out the 3 plugs, the PC finally booted up properly. And when I re-inserted the plugs with slack on the wires, the computer continued to boot up properly.
So based on what I described above, is it possible that the upward force on the audio card was causing a boot up fault ?
It is quite possible. If sufficient pressure was applied to the jacks, it could cause your entire motherboard to flex, which could either break connections or cause short circuiting, both of which could manifest in a boot failure.
You are lucky that no permanent damage (appears to have) occurred.
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