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PS4 only turns on if HDMI unplugged

I'm not a tech guy or had that specific issue, but speaking from experience with PS2s and PS3s, I've fixed a variety of funky problems by cracking them open and using canned air to blow out a bunch of fuzz and crud that accumulates inside. I've even found dead bugs inside one and other stuff I wondered how the heck it got in there. It just happens over the years that gunk gets inside there. If I ever had issues with my past warranty PS4, that'd be the first thing I'd try. Plus, you could see if there were loose wires or something.
 

Tanno

The Fantasy is the Reality of the Mind
You buying me a PS4 Pro? :)
Can't, because for 2 reasons:

1) You already bought a new PS4. Yours choice.
2) Can't afford the money to buy the PS4 Pro even for myself. Hard times right now. I want my money on hold to buy the Madcat fighting pad next month or so.

xD