Question What is my computer doing and how do I fix it?

Hey so recently I have been having a problem where when ever I try to power on my computer nothing happens. I hit the power button and 15-20 mins later, some times long it will boot and just flicker on and off like cray. I don’t think it’s the power supply. Anyone got any ideas?

https://youtube.com/shorts/04hZEtERDl4?feature=share

https://youtube.com/shorts/zyf4csHSmQc?feature=share
Here are some videos I took of it happening.
I wouldn't rule out the power supply or a bad connection.
 
If it's a bad connection....connections can take time to heat up and expand and become bad connections.

You can also have a bad connection in the PSU itself that becomes bad when it heats up.
I have check basically every connection and made sure they are all pushed in. Still no go.
 
bit of an update, once I hit the power button it takes like 30 mins for the computer to start flickering.
But once it’s on I can reset at a normal speed. And even shut it down and power it back on at a normal speed.

also sometimes it will be powered on and then just die. Are turn back on again.
 
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