Computer not turning on

Hello. I'm having a problem with my computer not turning on. It started when I moved my computer and plugged it back in. I've tried most things. Even jumpstarting the psu, which seemed to work by itself. I somehow got it to start randomly once and left it on until now. It worked pefectly fine once it actually started. Even beeped once, which indicated that nothing was wrong from what I read.
I tried changing the pins to use the reset button to start as well, but nothing. I also tried to unplug everything etc. Didn't start once.
But as I said, once I had tried all this I kinda tried every now and then to start it anyway, and one time it suddenly just started with one press.
Can it be the Psu still. Even if it worked with a jumpstart?
 
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