On my Onkyo Receiver it displays negative decibels

press and hold the video 1 button and then press the speaker A button - you should see 'clear' on the display. This will reset everything

Measure all hdmi inputs and output HPD Voltage by a needle probe.
Steps:
(1)unplug the amp.
(2)open the cover.
(3)connect a blu ray player to hdmi input & a mon to output, otherwise no 5V.
(4)negative probe connected to the large heat sink with large power transistors mounted by a crocodile clip.
(5)postive probe to right hand side last pin called hot plug detect, HPD.
(6)If it has 5V, hdmi board is OK. Check HDMI cables(7)If no 5V, check power to this board. Go to you tube:How to fix an Onkyo receiver - TX-SR606 . All large capacitors next to SMPS IC are replaced.
(8) If not OK, replace Q 8595-Q8597.
(9)If not OK, replace Q8501,sil9135.(Onkyo won't help you to replace this HDMI decoding Chip. A HDMI board replacement instead, the company policy.)

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easiest fix is to take all hdmi straight to tv. then come out of tv with optical cable to your receiver. that way what ever your watching will automatically be sent to the receiver thru optical. you even will get dolby dig. also you can have audio from your tv when you dont want to use your surround. keeps receiver on one input also.

Do you want to turn off the whole display?

There is a 3-way Dimmer on the front panel and the remote controller. The manual doesn't say if it will turn completely OFF.

if what Dark_Orbit said does not work try doing a master reset by ressing and holding the dvr/vcr button and stand by button simultaneously. This would erase all your assignments so you would need to reassign all your sources hooked up to your onkyo.

for your mute button:

check your setup:
*press setup
*go to Miscellaneous
*go to volume setup
*go to muting level
*make sure that the muting level is on minimum (press the left arrow or the left preset button)
*if it shows a negative infinite sign (its measured in decibels) its ok.
you can now mute it without the loud noise.

Abaout Remote:

Please make sure that the remote ID is set to 1. this would be on the setup menu of the receiver. The remote ID on the receiver should be the same as your remote. Please refer to page 94 and 98 of your owners manual. it would give you the exact procedure in how to set it.

Yes that would be your receiver. sending it back was the right choice. Good job :] i wish u luck if they send another one.

Hello, if the settings are correct and the subwoofer has been tested and working.the receiver would need to be serviced. Thank you, Onkyo USA

You can download the manual from the link below: http://www.intl.onkyo.com/downloads/manuals/pdf/tx-ds787_manual_e.pdf c. Power On Volume This sets a designated volume setting for the TX-DS787 to be set every time that the power is turned on. This prevents the TXDS787 from being turned on while it is set to an extremely high volume and suddenly output very loud sounds. For the absolute volume display method, this can be set between min and max. For the relative volume display method, this can be set between ?? and 18 decibels. If you do not mind having the TX-DS787 turned on with its current volume setting, set this to "Last." Please update the question & let us know if the information given was useful to you - Good Luck!