My acer projector x113p shows no signal and lock symbol,how can i fix this

it means the projector
locks on this source type and there is no such type of input
signal found,

so you need to try new input source type . means : if you use for example VGA, try to use other input type such DVI , HDMI

acer pd100d does not receive signal from pc or laptop, changed cables too. only shows white screen with acer logo and no signal, worked until yesterday, buttons dont respond and cannot reset the unit to factory defaults. please help

The max resolution on the projector is 1024x768. But the problem you're having sounds suspiciously like the laptop not sending out a video signal...you have to *tell* the laptop to send out an image to an external display. On one of the function keys, like F4 or F8, there will be a small TV screen symbol. You have to press and hold "alt" and then press the key with the symbol. The initial setting is obviously for the laptop only. When you press the keys for the first time, you tell the laptop share the picture with an external display (your projector). Press the keys a second time, and the laptop ONLY displays an image from the projector. And, press the combination again, you're back to just the laptop.The DLP projector should have a menu selection for "auto" under the input menu...that is the easiest and most trouble-free setting. Whatever you connect to the projector, it automatically seeks out the signal and connects to it.---Rick

Keep the computer on when you plug it it
so have the computer ready

is there a lock swich and can you reset it srry i tried

Kindly contact to Co's service center.

Toshiba TDP-S8 projector cannot communicate from my laptop, it shows no signal. how can i fix it? thank you so much...

A Function Key cpmbination is driving display choice: on my Acer (travelmate) is FN + F5 on your model could be different (On Compaq 6710 is FN+F4)
Check your manual or your keyboard for function symbol (Blue marked).
Allow time to perform a switch

After half a day of tinkering around with my new Acer I fixed my problem, which I think is yours also. I connected it to my notebook, it read the signal 'D-Sub' or something like that, and after my notebook finished startup, it reverted to no signal. I tried it with my desktop and it worked just fine. The display will only show up on one output device. It worked fine on my desktop because I was unplugging my monitor in order to hook up the projector. Hooking the projector up to my notebook left the display panel still active and that was where it displayed. In case I'm not making sense, the solution is this: After setting everything up, hit Control+Alt+F1 to switch display from your screen to the projector. To switch back, hit Control+Alt+F3

I have the same model of Acer and it worked in all of my classroom LCD with powerpoint lectures and with a SONY TV at home. Try right-clicking your screen to view the NVIDIA control panel. Configure "dual" multiple display (costumize to "dual" configuration or "forced-detect."