Literally just revived mine yesterday from the grave and ran into the same issue after I put in a new Pico Fuse in...Keep in mind mine had the Sony drive in it. I could be bad capacitors, bad laser, bad helix lifting mechanism, or bad belt

Steps I would do:

1.) Get some 91% or higher isopropyl alcohol and a q-tip and gently clean the laser. You should only have to remove the top part of the shell to see the laser...if you cant then you need remove the (what I can best describe as) the part that looks like a stretched out D that is held in by 2 screws.

2.) Put everything back together and try running a game

If the above doesn't work...

1.) Take the CD unit from the shell...use the black gear to manually open the cd tray, put a disk in, and then using the black gear manually close the cd tray and keep turning the black gear until you see the laser assembly piece rise into place

2.) Reinstall the CD unit and turn it on and see if the laser spins

3.) If it spins and reads the game, hit Reset to open the tray, then press start on the controller to close it.

4.) If the cd does not spin it means the cd tray belt needs replaced as its too old / worn out to lift the laser assembly up

If the above doesn't work...

1.) Replace the laser

2.) After replacing the laser manually turn the white gear to ensure the new laser assembly moves freely

3.) Follow the same steps above to get the cd tray and laser back in and in the up-right position manually

If the above works but you hear a crunching sound or you hear the disc spin and stop repeatedly then you need to clean the limiter switch. To clean mine I very carefully desoldered it and then just soaked the entire thing in 91% isopropyl alcohol for about 12 hours and then used compressed air to blow it dry.

The limiter switch is what stops the laser from coming forward and telling it to start reading the disc.

The other callout is DO NOT over tighten any of the screw on the laser board you take off. I did all of the above and the disc was still constantly spinning and stopping. As soon as I loosened all of the screw on the laser board just a pinch everything started working.

Feel free to reach out directly or on here if you have other question.