Sometimes I'd have to eject the disk, and just go through all that again. I remember it trying around 4 or 5 times, then pause, then another 4 or 5 times, before it would give you a disk reading error. Sometimes it would work on the first attempt, sometimes on the 2nd, 3rd, 4th etc. When you hear that attempt again, you can try and hit it again. When the drive tries to read the disk, you can hear it trying to spin and find the spot it needs. I was surprised at how hard I had to hit it. When I put the disk in, as soon as I hear it's in and stopped inserting, I would "hit" not "tap" that top left corner. On the PS4 Pro, the disk drive is on the front left side of the console. It now reads discs quickly and quietly 100% of the time! I can’t believe something so simple and honestly a little bit stupid has worked so well. But turning it upside down vertically 100% fixed my problem. I changing it to horizontal, this didn’t really help. Lastly I changed my PS4’s orientation, I have mine vertical by default as I have limited space. Next I began messing about with applying pressure above the disc drive with my hand (squeezing the front and back together) as I inserted the disc as some people suggested knocking on the console. Secondly I tried forcing my pro to update in safety mode to rebuild the database as I heard that could help, but again it didn’t. First I tried completely dismantling my pro to get to and clean the disc drive lens, but it already looked pretty clean and that didn’t make a difference. After this I’d get a pop up saying unrecognised disc. I had a problem where when I put any disc in it would chug a bit then sound like the disc was being relocated then chug a bit more. That should be it! If it doesn't work you can try to adjust the servo that regulates voltage to the lasers instead but that could fry the lasers out reducing the PS4 to junk! Good Luck! The first thing is to open the PS4 up and blow it out with air from a Air Compressor to reduce the dust, heat, static electricity that dances all over the place because of the dust! Not only does the dust contribute to the items I just wrote above but it also causes tiny electric arcs if there is to much dust on the circuit board too! Remember to first blast the inside with air from a Air Compressor then clean the lenses with an eraser gently, then use alcohol on a Q-tip on both the lenses and metal contacts and blow it all out "again with air" from a Air Compressor! The air from the compressor should dry the 90% or 91% alcohol so that there will be no shorts. Both need to be cleaned by an eraser and then by a Q-tip with 91% alcohol. The Laser of the Blu-ray has actually two lenses/lasers/LED's. From there it is out the fan across the top sheet, then the CPU/GPU heatsink, again with memory dimples, and out through the hot parts of the power supply.It simple really. The cutouts over the fan intake are particularly strange, square holes, small round holes, L shaped holes. Now the air comes to the fan intake via those small holes and a couple of vents over the hard drive. The air cools the sheet, cools the memory chips by little dimples on the sheet and then is sucked through the sandwich by many small holes in the sheet metal and then through the mobo- yes, there are airholes strategically placed on the the mobo! Look by the battery for most of them that are directly over the fan intake. The air come in through the top slots, over and through the bottom of the sandwich as the mobo is upside down. There is a aluminum-mobo-aluminum sandwich about a half inch thick in between. The air comes in from the top of the back and goes out the bottom of the back. Figuring out the airflow of the PS4 is like doing origami.
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