There are two different displays for the Moto Z4. Most vendors have not even labeled this difference yet. One variant is curved at the top and bottom, and the other one is flat at the top and bottom. Your original display is curved at the top and bottom, while your replacement display is straight at the top and bottom. The circuity including the SMD capacitors are also different on these two different versions. It does not matter if you search by model. This is the case for both XT1980-3 and XT1980-4. There have been a few different phone models with this problem. For example, the LG Stylo 1 had two different ICs, a small one and a big one. Have seen others like this, but it’s uncommon.
Your exact symptoms are unclear. Is the optical drive not feeding the disc, that is, you can’t insert discs? A loose cable can cause that or the blue rollers need to be repositioned including the white rod between them. When you open the Blu-ray drive by the gray cover with gears and springs with three screws holding it with the blue rollers facing you there's a white sliding mechanism on the left side that needs to be pushed forward where you can slide forward and back. You need to push this slider forward. Then, you can push down on the blue rollers, and they’ll naturally lift back up. If the drive is not reading discs, then you need to clean the laser lens with alcohol or replace it. If that doesn't work, then replace the optical drive. The new drive will need your original drive’s PCB as it’s married to the console’s motherboard. If you've narrowed it down to the drive's PCB being bad, check to see if the fuses there are shorted or other faulty components. Last resort is to swap the 128-pin IC chip to...
Just did an iPhone X screen replacement for a customer. Face ID worked fine. Ambient light sensor or automatic brightness did not work though. It has been said from another source that technicians are damaging the flex cables or components causing Face ID to fail.
Some precut adshesive already adhered to some screens is not that great. Not all tape and adhesive are equally good for sure. Ensure frame is clean as possible. Using heat before clamping can help. Heat will help create a stronger bond. I use about 270C along a side with a hot air rework station to the point where it's too hot to touch then clamp. Continue this along the perimeter of the device. If the frame is deformed, it can cause lifting and need replaced. Some techs use a tiny drop of glue at the corners.
Measure the voltage output on the charger. Confirm whether it's good or not. If good, take out the battery and hold the power button for 30s. Connect to charger again without battery and try to turn it on. The Dell Venue 5130 Pro will turn on without a battery. Don't know which model you have but the 5130 variant that I serviced required input of 19.5V and 1.2-1.54A, so a regular phone/tablet won't do. There's a microUSB and some other proprietary port to charge that it had.
Most likely the home button flex was damaged. The home button extension flex that routes through the LCD display backlight film may be partially disconnected from the logic board, torn, or just bad from the vendor. There's a chance the display screen you ordered is the issue--have observed some replacement screens yield this result although it's rare.