I am trying to hook up a ps3 to a lg tv at Marriott in Napa ca. The TV is an LG 37LC5DC and is ran by a LodgeNet remote. The TV has two HDMI inputs in the rear, but when I try to change the input via the TV side buttons, the TV says AUX Input Not Available. How do I hook up the ps3?

If your Sony Blu-Ray player and LG TV are recent models, each should have an HDMI cable connection. HDMI is an method to connect your digital video and audio devices with just a single combined cable. In the case of your LG TV, using an HDMI cable will allow you to send the HD video signal to your TV's screen, and allow you to hear the sound through the TV's speakers.
Your LG TV may have multiple HDMI connectors, to allow other devices to send signals to your TV, such as a cable box or satellite box or digital video recorder (DVR). Your Sony Blu-Ray player will usually have just a single HDMI connector.
Purchase an HDMI cable from your local electronics store. There are different versions of the HDMI specification, and you should get a cable that you can verify is certified for the HDMI version 1.4 specification.
Plug one end of the HDMI cable into the Blu-Ray player, and the other end into one of the HDMI connectors on the TV, noting which one you selected.
When you turn on your Sony Blu-Ray and your LG TV, you should use the remote for the LG TV to select the input source. Your LG remote should allow you to select the HDMI input connector you used, at which point you should see the display of a DVD playing on the Blu-Ray player. If you cannot hear the sound, use the LG remote to increase the TV volume.

There is an adapter that goes from HDMI to DVI, There is even a cord that is HDMI on one end and DVI on the other.
A lot of TVs have the VGA PC connection on the back, not sure if your model has it, but you need DVI specifically and its not as common on TVs.

Verify what input source your LG television is on. Using buttons on the tv or the remote you can change the input source. The input you want to choose needs to match the connection type of the dvd player. For example if you are connected using HDMI, than you will want to choose HDMI from the input source menu. There may be more than one HDMI so be sure to try each one.

Try these One For All Universal remote LG codes: 0056,0030, 0178, 0056, 0019, 0032, 0001, 0017,0178, 1265

You should be able to as long as your TV has an HDMI input. The PS3 supports a bunch of resolutions, and should auto-detect the highest resolution your TV is capable of once connected by HDMI.

LG documentation states:

When you use SIMPLINK function, you have to

connect to the OPTICAL IN 1 jack to enjoy TV
sound to your speaker system.

Basically you need to have the Audio go from TV to receiver and setup receiver to that Input to output surround sound to all speakers.

If you have a cable box or satellite receiver, hook that output into the receivers input and that should work.

My setup is DirectTv HDMI output goes into the LG Home Theater HDMI Input 1, and LG goes HDMI output into the TV HDMI input 1.
so to watch DirectTV, I switch LG Home theater to HDMI Input 1. and TV is on HDMI input 1 (to view LG HDMI output from DriectTV, Blu-Ray, Vudu, etc.)

As you already checked PS3 and HDMI cable,
select HDMI input in TV and connect PS3 via HDMI cable. TV should show PS3 picture.
And if still no joy then HDMI input port in TV is bad and need to replace input board/ main board.

Be sure you have the HDMI cable in the correct slot for the input channel you are trying to connect. Try another input channel like HDMI 2, 3, or 4 depending on how many channels you have. If you have another TV with HDMI, try plugging it in the other one to see if it is a problem with your TV or the PS3.

u need tv remote, with that u can go to the options for ur tv and enable the hdmi allowing ur ps3 to come onto ur tv.

use hdmi cable from ps3 to rear of tv (you should have hdmi 1 & hdmi 2)then ppress input on remote until you get hdmi 1 or 2 on screen walaa