Hdmi inputs stopped working

Is it set to handle HDMI?

if you can select the hdmi inputs ok
and swap them around without a good result

if no image etc
you would expect there to be a default no signal message or error something on the viewing screen
if a total blank
could be possible the Projector unit has a internal board failure

Panasonic PT-AE3000U Operating Instructions Manual - ManualsLib

https://www.manualslib.com/manual/246284/Panasonic-Pt-Ae3000u.htm

try unplugged all units involved---HDMI does not like being hooked or unhooked with units powered and or on.

Wait a while and make the connections and then power set, box, whatever is inline back---the units will try to reboot and that may cure the issue- it is worth trying

Maybe the problem is not from cables but from HDMI hole/jack, rusted or something

I'm having the same problem. The projector stopped recognizing any input over either of the two HDMI inputs. The JVC RX-D411S receiver was working fine up until I used the VGA input with a computer and since that time, HDMI has not worked (despite working fine before). I tested two HDMI cables into each of the two ports but nothing! All other inputs work fine.

why hdmi input wont show up

Right now there seems to be many people with the same TV problems with sony and HDMI cables. Most of the solutions are resetting the TV and sony product. Try leaving your TV unplugged for a hour to let it reset itself.

If you accidentally set your PS 3 for 1080p resolution, when the TV can only support 720p, you get a black screen. The Westinghouse TV I used displayed a message that said "invalid format." To reset the PS 3 to the standard AV format, you shut the PS 3 off. Then you hold the PS 3’s power button down for about 10 seconds. It will reset to standard video

My HDMI has stopped working. I have had a technician from Dish network out to my house 3 times and they have replaced the receiver and the HDMI cable and were unable to get the set to work all I get is a blue screen and a message which reads no signal. I also cannot use mt set using 3 rca cables connected to the component input when set to 1080 I keep intermittenly get a black screen then a blue screeen and sometimes a no signal message. I have to watch the tv set to 720 on component 2 and it is the most stable in that setting. Please send help

Try to replace the Main Board one more time.