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Hi CL, The only suggestion I can think of is to press the Reset button with a pencil in the lower right of the unit.

I have the 256GB version and it works great on my NEX4000 formatted as FAT 32.

Thanks joe. Did you get a Samsung again or did you buy a different brand SD card?

Sorry to hear of your pain. If possible, I would send it to Pioneer instead of an authorized repair center. I have heard of cold delaying the screen from working until it warms up.

Nice. Let us know how the 256GB SD card works.

It has USB 2.0 per the owners manual on page 85.

Great post. Based on your observations, it would seem (my guess) that the connector you used (not the connector quality) with your 4S is not bypassing the iphone's dac. I found this on Crutchfield's website. iPod/iPhone Control iPod Connectivity w/ DAC Bypass: The Pioneer AVH-4000NEX supports direct connection of your 30-pin or Lightning-connector iPod/iPhone through its rear-panel USB port, HDMI input, RGB port, and 3.5mm jack. The AVH-4000NEX offers audio/video playback, music navigation, information display, and charging of select Apple iPod/iPhone models. It also provides a sp

Just to be clear, I was referring to the Aux out of the phone where the phone is converting the music from digital to analog via the phone's DAC. (phone aux out, head unit aux in) I would agree that if you are using the phone's digital connector and the head unit is receiving the digial data and converting it to analog in the head unit, then the sound quality should be the same as using a USB hard drive directly plugged into the head unit. (using like for like as the digital source) Happy holidays.

Use the DAC in the head unit whenever possible. As I stated in my post above, the DAC in the 4000 sounds much better than my Samsung S4 phone, as I am sure it's the case in most/all phones. I used the same flac file in my comparison.

I have a NEX 4000. I compared my Samsung S4 aux-in connection to the USB1 Input using a 256GB SS hard drive using FLAC (44khz, 16 bit). I played the exact same FLAC file on both my phone and NEX 4000 USB1 and I will never go back to the phone aux-in again. There is a significant sound quality improvement playing the FLAC files directly on the NEX unit. The bass is deeper and tighter and the mids/highs are well defined. The unit has a great DAC. I now realize that a phone is not an audiophile device!