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I cannot even start a multiplayer match on call of duty IW or MWR without my PS4 saying it cannot read the disc, close the application and eject the disc. I can't play the game at all. Anyway to fix this? I've tried rebuilding database, etc...
Try Alex's idea first. Could be a dirty lens. If that doesn't work, it's likely a faulty laser. I've owned 4 generations of PlayStation consoles, 2/4 had disc read errors from a bad laser. Bought a new PS2 when it happened and replaced the laser on my PS3. If the cleaner doesn't work you have 3 options. A) send it in for repair if under warranty or pay them if it's not. B) buy a new console. 3) replace the laser yourself. I fixed my PS3 for 25 bucks and I imagine it costs the same on the PS4.