Pioneer DMH-C2550NEX Digital multimedia receiver does not play discs

Product highlights:

General Features:
digital multimedia player with AM/FM tuner
touchscreen and chassis can be installed together or independentlyfits problem vehicles where standard radios won't fit

plays media loaded with MP3, WMA, AAC, and high-res FLAC music files
6.8" Clear Resistive touchscreen display
built-in Bluetooth for hands-free calling and music streaming
Smartphone Features:
Android Auto compatible
Apple CarPlay compatible
WebLink allows access to apps and Amazon Alexa
display and command of select music, navigation, and other apps with iPhone and Android
Pandora and Spotify control with iPhone and Android
Siri Eyes Free control for select iPhones
Voice Command for select Android smartphones
Audio/Visual Features:
13-band graphic EQ
time alignment and Auto EQ (mic required, not included)
Expandability:
compatible with SiriusXM's aftermarket satellite radio tuner (sold separately, subscription required)
inputs: rear USB input, two rear audio/video inputs, dual camera inputs (second input uses rear composite A/V input)
outputs: video output, 6-channel preamp outputs (4-volt front, rear, sub)
Other Information:
wired connection to parking brake required to access settings and other features on this receiver (the brake must be connected and set for video display)
built-in amplifier (22 watts RMS/50 peak x 4 channels)
compatible with most factory steering wheel audio controls (adapter required)
works with iDataLink Maestro moduleretains factory features in a wide selection of vehicles
displays engine performance and other vehicle data on touchscreen

wireless remote included (optional wired remote)
optional touchscreen/chassis extension cables
MFR # DMH-C2550NEX


What's in the box:
Pioneer DMH-C2550NEX owner's manual
Touchscreen monitor
Chassis body (10A fuse)
Wiring harness
AV/Preout harness
2 Mounting brackets
Remote control (CXE5116)
CR2025 3V lithium battery (installed in remote)
58" USB extension cable
Microphone w/ visor-bracket (attached 13' cable terminated by a right-angled 2.5mm connector)
6 Pan-head ISO screws (M5 x 6mm)
6 Counter-sunk ISO screws (M5 x 6mm)
8 Pan-head screws (M4 x 5mm)
Installation Manual
Quick Start Guide
Warranty Sheet