Projector powers up as normal, bulb comes on, displays Optoma logo on screen and menu will show on screen. The issue is that although I have 3 devices plugged into the HDMI port of the device using a HDMI splitter the device sees no input. The projector has worked flawlessly for months and now this issue has come up. What I have already done: bypassed the splitter and plugged devices directly into the projector, used different HDMI cables. No change, projector continuously scans for a signal and shows "no signal"

Reset instructions according to this
https://factory-reset.com/wiki/Optoma_Service_Menu
Optoma Service Menu Instructions Most of our Optoma Service Menu methods require the use of an original remote, typically you can not do it with just the buttons on the front of the set. If you no longer have your remote or have damaged it, we recommend that you purchase a Optoma Remote before trying to enter the service menu.
Method 1

1. Press simultaneously {UP} & {ENTER} buttons twice.
2. Press simultaneously {LEFT} & {ENTER} buttons twice.
3. A Service Menu will be displayed
   1. Then to access the Full Service Menu: Press the {UP}, {LEFT} & {DOWN} buttons once.
4. To exit, turn the Projector Off.

Method 2

1. Press the {UP} {UP} {LEFT} {LEFT} buttons.

Method 3

1. Press the {POWER} {LEFT} {LEFT} {MENU} buttons.

Method 4

1. Press simultaneously the {RE-SYNC} {ENTER} {SOURCE} buttons on the Projector.

Method 5

1. Press the {POWER} button.
2. It will show: "Power Off" or "Picture Mute".
3. Then press the {LEFT} button 8 times slowly.

Method 6

1. Press {MENU} {6} {1} {9} {MENU} buttons.
2. To exit the Service Menu: Press {MENU} {6} {1} {9}

It is one of the fan, it is bent or out of place and cause reptead disturbance at cyclic intervals. The projector must be taken apart and examined on the inside

Depends on the model. If you saw a little fan, then there is a fan problem. There might be 3 fans. 2 square ones and one blower fan. Look for plugs with 3 wires(red/white/black or red/yellow/black). Those will lead to the fans from the mainboard. Occasionally the fan will spin but the tachometer lead will stop reporting the fan status and the projector shuts down. To being with I would clean out the projector fans and ducts thoroughly. That may clear up the issue. Otherwise there is a button press sequence to enable the service menu, but you cannot upload new firmware without special optoma software that isnt available. Another possibility is you have failing filter capacitors in the power supply. Be careful poking around under the hood. There is lethal high voltage possibly stored even when unplugged.

are you managing to get into the menu at all and reset filter and lamp hours?

By the way - although optoma what cheap option for our school, i now get hitachi with 3 year bulb warrenty.... mine BURNT out luckily not at weekend or school may have gone up too - expensive optoma really then if that had happened.
good luck

Possibly a bad ballast or power supply going to it causing it to either kill the bulb or your old bulb may still be good. Did you rest the counter in the menu for the bulb life after replacing?

you need to reset the Bulb Hours in the on screen menu. it turns off because the bulb contains mercury and after a certain amount of hours the bulb will burst, spreading mercury every where. reset the bulb hours and it should stay on.

I think it's a lamp driver issue from what I've seen others have gone through. I also read that if you go through the sequence of unplugging, plug back in, wait 20 seconds and try to turn on, multiple times, it will finally kick on and work. I just got mine to turn back on by doing this and waiting through the fan cycling without the light turning on. After the 4th sequence the light flickered. After the 7th sequence it finally turned on and is working. Now I can watch the Super Bowl and will look into replacing soon.

You must tell the laptop to change display mode--there are 3...Normally, the key-press is something like "function key, F4"--look for a small tv screen symbol on one of the "F" keys--default mode is "laptop only", Press and hold "fn" and then press the appropriate "F" key, the laptop will switch to "laptop/external display". Another set of key presses will get "external display only" mode. And, finally, the next sequence will bring you back to the default mode. Make sure you turn on the computer and *then* turn on the projector to head off any sync probs.---Rick

Your projector is LCD based. That is, basically, a tiny panel is a computer monitor with a lamp behind it to shine through the panel and lense, onto the screen. This all white screen means the pixels of the LCD are all "deactivated" allowing all the white light through. This happens on computer monitors from time to time. I cannot find a blind reset, meaning there's isn't a method of holding down a series of buttons to "reset" the projector.

aside from calling support, as their manual is useless, I would recommend powering the unit off and then unplugging all cables, including power.

Press and and hold the power buttons for 20 to 30 seconds to see if it clears up your issue. Sometimes, after unplugging the unit and pressing the power button on the projector will briefly light the panel lights and then they fade. This may be enough to drain enough power to force the projector to reset to normal conditions.

If if that doesn't work, I'd recommend leaving it unplugged for a day or so and try it again. Beyond that, the controller board for the display may have failed. It shouldn't be the case, but it is possible.

However, I feel the unit needs a simple reset, which normally you'd do though the menses, which obviously possible.

OK, found the solution on the net, you have to use the buttons on the projector instead of the remote to access the menu item.