Few days ago I went on took out my GPU to see if there's enough space for my next GPU upgrade, then put it back in place. However, that night when i tried to start it, the can hear the DVD drive and CPU fan, case fan spun for half a second and then stopped, it won't start while it kept doing it automatically. I thought it was problems caused my dusts, I cleaned everything with a air blower and a vacuum cleaner without touching the mobo, and it started eventually, but the problem came back today. Having no idea of what happened, i checked on all of my cables to see if they are loosed , and it still won't start. Then I decided to send it for repair, still, I gave it a last try, after accidentally banged it on the floor, it started normally, except for a bit of stuggle( DVD drive made weird sound)
Now I'm guessing that it is the power button causing the problem
A bump and it starts working again - suggests a loose component - as you have checked the connections (worth doing again) - remove and refit graphics card and memory sticks to make sure fully home in their slots - check the connections to the hard drives and DVd drives as well.
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