If the laser isn't moving, it can't find the start of the disc. With the power off, use a plastic tool (like a spudger) to gently nudge the laser assembly back and forth along its metal track.
Look for any "bulging" or leaking cylindrical components on the motherboard. If they are swollen, they need to be desoldered and replaced. How to fix a non-working DVD player? - Facebook Portable Dvd Player Repair Manual
Ensure the physical lock or "Hold" switch isn't engaged, which prevents buttons from responding. 2. Internal Troubleshooting (Opening the Case) If the laser isn't moving, it can't find
Some players "freeze." Unplug the power, remove the battery if possible, and hold the Power button for 30 seconds. Some models have a tiny RESET pinhole on the side or back. If the laser isn't moving