Hi I have a NEC NP500ws, the unit would not turn on and the lamp light is steady red, and status light is steady green. I changed the light bulb, but the problem remains.

SOURCE: Lamp will not come on

try pressing and holding the enter button on the projector for about 30 seconds - this resets it. It worked for me!!

SOURCE: NEC LT240 has Power, Status & Lamp indicators lit & wont turn on!

If your bulb finally reaches it's end before you have the chance to replace it you unit will shut itself down and go into a permanent standby mode. Changing the bulb alone will not remedy the issue. The solution is quite simple but not posted in the manual or anywhere else that I could find for that matter! All that is required is to hold down the HELP button on your remote for 10 seconds while aiming at the infrared sensor on the unit. This will reset the units bulb timer and remove it from the standby mode.

SOURCE: NEC VT 470 projector won't work at all

Try pressing the HELP button. Don't release and press the power button. The LED lights should blink. Release then try to power on again.

SOURCE: NEC VT 595 wont turn on. Just red blinking light

I had this same problem with 2 NEC VT595 projectors. My problem was that there was a broken "tab" on the lamp cover (the plastic cover that slides in place over the lamp) that is supposed to depress a switch which insures the lamp cover is in place before operating the projector. The tab was broken in half and not making the connection there for causing the blinking status light (.5 sec on, 2.5 sec off) indicating a lamp housing or cover error.

SOURCE: Flashing red status light on NEC VT45 projector

make sure the doors are shut all the way! there is a little button there.