Why is my unit not coming on but still ejects cds

Most car CD players will eject the CD with only the constant (memory) lead getting power. So if the switched power lead (usually red color) is not getting power but the constant lead (usually yellow color) is getting power, then the head unit won’t turn on but it will eject the CD. So check the switched power lead and make sure it’s getting 12V when the car is turned on or the key is switched to ACC.