Have no radio,c d player,navi and a/c blows on auto only no light in display

It is important to follow the wiring recommendations supplied with the radio.

The illumination is usually connected internally so the screen lights when the radio is switched on but as the wire is available, where it is connected depends on whether the display can be seen without the illumination and whether the radio is activated by the ignition key or supplied direct from the battery.
If the radio has an output for an electric aerial or aerial amplifier, it would be as well to connect the illumination to this or otherwise connect it to position 1 of the ignition switch.

The dimmer wire is connected to the dashboard illumination lights...

Make sure the illumination wire is connected

time to rip it out and fit a after market one ,it sounds like microprocessor has packed up and its cheaper to replace than mess around trying to get it repaired

I'm guessing you're talking about the dash light aound the radio. The dash lights around the radio share the same fuse with all the other lights that come on when you turn the parking light on. If the other light are working then your fuses are fine. What i think might have happen was when you took the dash cover off, the bulbs behind it might had burn out. You might want to try new bulbs.

good luck

Subject: Radio With Six Disc CD Changer Does Not Recognize Loaded CD And Displays An "INITIALIZING" Message, CD Will Not Play, CD Cannot Be Ejected, Or Disc Icon Does Not Illuminate (Reprogram Radio)
Models:
2005-2006 Chevrolet Avalanche, Suburban, Tahoe
2005-2007 Chevrolet Colorado, Express, Silverado Classic, TrailBlazer
2005-2006 GMC Yukon, Yukon XL
2005-2007 GMC Canyon, Envoy, Savana, Sierra Classic
2005-2006 HUMMER H2 with Six Disc CD Changer Equipped Audio System (RPO UC6)
Condition
Some customers may comment on any of the following conditions:
• The CD loaded in the radio will not play.
• The CD loaded in the radio will not eject.
• The disc icon on the radio will not illuminate.
• The radio displays an "INITIALIZING" message for approximately 30 seconds after vehicle start up.
Important: Do not attempt to play CDs with paper labels on them in this CD player. The labels may warp or wrinkle and jam the CD player mechanism. Refer to the Compact Disc Care and Cleaning procedure (Document ID# 1656123) in SI for more information.
Technicians are to reprogram the radio with new operating software using the following procedure:
1. If the radio has a CD(s)2008 General will be necessary to reset the radio and remove them
before the radio is reprogrammed. Remove and reinstall the radio fuse to reset the radio and then eject the CD(s). If cycling the power to the radio does not allow the CD(s) to be removed, the radio may have another failure that will not be corrected by the reprogramming procedure that follows. Refer to the Diagnostic Starting Point - Entertainment procedure in SI to begin your diagnosis of this failure to eject CDs concern before reprogramming the radio.
2. Reprogram the radio using the Service Programming System (SPS) with the latest software available on TIS2WEB. Refer to the SPS procedures and the Radio Programming and Set procedure in SI for more information. As always make sure your Tech 2® is updated with the latest software version.
3. Verify proper operation of the radio and make sure that all CDs can be ejected.

Hope helps (remember to rate this).

The following is the owner's manual for your 2004 Dodge Neon:

http://www.dodge.com/en/owners/manuals/index.html?year=2004&nameplate=Neon

P.99 describes how to load discs:

1. Select and press any numbered button without an illuminated light above it.
2. Insert the CD while the light above the chosen button is flashing and the two lights on either side of the slot are illuminated.
3. Upon insertion, the CD will begin to play, and both the button light and the lights in the corner of the loading slot will illuminate.
4. Repeat the process for loading any additional CDs. The CD playe rwill stop while additional CDs are loaded.

Playing Discs
The radio will show the CD number, the CD track number, and the Track Time Elapsed while the radio is in the CD mode. IF more than one CD is loaded in the changer, the changer will automatically play the next disc after playing the last track of the current disc.

Wow, that's a lot of typing.
I didn't know the 2004 Dodge Neon had such a nice changer.
Good luck.

this happened to me after 2 years of having my 2006 Mazda 3, luckily i was still within warranty. the entire LCD had to be replaced in mine

remove all fuses one by one and check wich one is blown if blown replace it and see if radio and clock works

were the lights working before?
sounds like a defective radio.

The 2002 and the 2007 radio connections are markedly different. Remember that the 2007's are "satellite ready"; this changes the back side wiring configurations dramitically.