It may seem obvious, but have you checked the display dimmer settings? Under the front cover is a button marked dimmer. Pressing it cycles through progressive display dimness settings until it goes off. One more press goes back to full brightness.
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If you can solder, you may be able to fix this. Many of these that I have seen have poor solder connections at the display itself. Carefully open up the unit and locate the rear of the LCD panel. There should be a long line of connections. Check the ones on either end. These are the supply and ground connections. Quite often these connections crystalize and break. Resolder them and try the unit again.
In short, HDMI will not work. HDMI is riddled with issues, your's is just one of many! HDMI version 1.1,1.2,1.2a,&1.2b do not work 100% on any receiver. The current version is 1.3b and "so far" it works... Now the bad news; It's not just a software patch to fix the problem, it's a hardware issue as well. If your unit is still under warranty, the manufacturer will update hardware and software for you at N/C. If it's out of warranty, it's way too expensive to have done! The fix is to run your HDMI directly to your TV from source, ie. Cable,DVD, etc. then run coaxial digital or optical to your receiver for audio. The catch.. How many HDMI inputs your TV has will limit sources hooked up via HDMI. If you want further info on HDMI issues, just google "HDMI forums" and there are many different sites to answer the problems of HDMI. Hope this helps.
There are firmware upgrades on (some) receivers, call customer support for Denon, or an authorized service center. They can help you over the phone. If you need more help, post a comment and I can help you further.
I had a similar problem with my Denon 3808 after it had the protection circuit tripped. First all I would get is a blue screen with sound, then after powering the unit off I got the display back, but all of the on screen GUI menus were gone. I could tell that the menu button worked because display located physically on the recever worked. I reset/rebooted the system (follow the directions in manual) and everything came back. Be aware by resetting the system any customization you have done will be lost. Hope that helps
This can be either the display itself or the display driver IC havng problems. Something as simple as poor solder connections may cause this as well. Without seeing hte unit, it is difficult to say what the real problem is. If you can solder, try resoldering all of the voltage regulator ICs in the unit. These look like transistors and will be marked 7805 or 7812. If the voltages drift too low because of bad connections, the ICs can get "confused" and not work properly.