Pi2 No HDMI Output

[M52Whirlpool]

Hi,

I have a couple of Pi2's, RS sent me 2 replacements by mistake (my original from RS was DOA - the cpu got very very hot and it wouldn't boot). I'm now having problems with both of these Pi2s not outputting any HDMI signal. I do have an older model Pi (still running Wheezy 2013-02-09) which I can connect to the monitor or TV and power supply and get a perfectly good image - I believe this should rule out any problems associated with power supply, hdmi cables or displays as they have been proven good on the older Pi. I have 2 sd cards that I have prepared myself - one with NOOBS_v1_4_0 and the other with 2015-02-16-raspbian-wheezy I have tried both cards in both Pi2s without any hdmi output being displayed, I'm reasonably sure that they read the card OK as there is plenty of flashing from the green LED (not in a fixed pattern though - which would suggest missing files I believe). I have read and implemented the suggestions in a few guides
http://www.raspberrypi.org/forums/viewt ... 28&t=58151
http://elinux.org/R-Pi_Troubleshooting# ... put_at_all
So I have tried various combinations of
hdmi_safe=1
hdmi_force_hotplug=1
config_hdmi_boost=4
config_hdmi_boost=9
Pressing the numeric key 2 on the boot of NOOBs
I've even tried copying the settings from my older Pi that were optimised for my monitor i.e.
hdmi_drive=2
hdmi_group=2
hdmi_mode=58
But unfortunately I still don't get any hdmi output.
I'm convinced that I'm missing something obvious or doing something stupid.

[antokara]

I would suggest that you do not assume anything comparing old Pi to Pi2.

1. Older PIs have different power supply requirements. You need a power supply with about 1.8A output.
2. The HDMI cable might work with your old PI but that does not mean it will work with your new PI2
3. Make sure your SD card works and is supported, otherwise it does not boot and you get no hdmi signal...

Trust me, I had a very similar problem with you.
Already posted a new topic about it.

[M52Whirlpool]

Thanks for taking the time to reply antokara.
You make some good points.
The power supplies that I am using are rated 1.8A or 2.0A, I should have stated that in my original question.
The SD cards are 8GB class 10 Kingston, from Amazon directly so I'm pretty sure that they're genuine.
The Pis are booting OK, proven by using the 2015-02-16-raspbian-wheezy card and connecting the pi to my router via an ethernet cable, checking the router for the Pi's IP address and finaly using ssh to connect.
I guess that just leaves the hdmi cables, I have 3 of them, all are 1.8m or so long, 1 is unbranded, 1 is Tecknica, the other is from an xbox one.
I'll try to get hold of a shorter, good quality hdmi cable - thanks for the advice.

[Bananaguns]

Are you swapping the same SD from your Pi to the Pi 2? Or do you have two separate cards? I would suggest formatting an SD card, then writing the raspbian image to the card (without noobs) and then trying. From what I've read noobs uses a different method to detect the display than the config.txt file. If you don't have anything too crucial on the SD, I would recommend trying this.

[M52Whirlpool]

Hi Bananaguns,
My old Pi is quite an early model, so it uses the physicaly larger original SD cards, not the micro SD cards used by the Pi2. Therefore I'm not swapping cards between the old Pi and Pi2, although I suppose I could if I used an adapter, but I'm not.
One of the micro SD cards that I'm using does indeed have 2015-02-16-raspbian-wheezy installed, unfotunately I get the same lack of hdmi display with that as I do with NOOBs.
Thanks for your advice

[Bananaguns]

Ah yeah, wanted to make sure. Well maybe try

Code: Select all

config_hdmi_boost=7

According to elinux.org 7 is the max value. That may help but I doubt it. To be safe I'd try commenting out anything you've added and if that doesn't work I would uncomment

Code: Select all

hdmi_force_hot plug=1

Then

Code: Select all

hdmi_mode=2

Also make sure your monitor is on and not sleeping when you power on the Pi, its unlikely but possible that the pi isn't detecting your monitor if its sleeping and just assuming theres no monitor.