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I've just got my raspberry pi.

When I first tried, everything went on well, I got the image on me TV and I tried to set wireless connections.

But when I was trying, the screen suddenly displayed "no signal", I tried to reboot(just cut the power off)my pi but it didn't work. I tried several other times and checked the connections, but they seemed all good.

Later I searched on the Internet for the solution. I tried some but nothing worked.

Now as I give the pi the power supply. The PWR light goes steady red and the OK light flashes green for a while and then goes out. No other signals at all.

I really need some advice, how can I get image on my TV again? Do I need to change other settings or am I simply better to buy another pi or another HDMI cable? Any idea or solution is really welcomed and appreciated!

PS: I can see the dim ACT light flashing

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please, try to reverse the HDMI cable, connect the end that went into the TV to RasPI and vice versa, might solve this problem. –  lenik Jun 30 '13 at 9:00

4 Answers 4

I would suggest you to re-flash your SD Card(i.e your OS).There are chances that the one/more of your vital OS files got corrupted,resulting into your Pi unable to detect any valid OS(statup problem).

The no-signal is a consequence of the above problem.....Hope you get to use your Pi once,you re-flash it again.

N.B: In-case you purchased a pre-loaded SD Card....here are the steps to do it again yourself.

Assuming you have a linux box handy.............

  1. Download your favorite Raspberry Pi OS image from here.
  2. Insert the SD card into a linux box.
  3. Open terminal, and execute $df -l
  4. You get a list of all storage devices connected to the computer, try to deduce your SD card from its size/name.

    Eg: /dev/mmcblk0

  5. To re-flash the SD card,we need to unmount it,this way:

    $umount /dev/mmcblk0

  6. Assuming your pwd[present working directory] has the OS image,execute the following command.

    $dcfldd bs=4M if=.img of=/dev/mmcblk0

    Note: This process may take several minutes,any interruption may result in SD becoming corrupted.

7.Now, you have a re-flashed SD card,slide into your raspberry, and hope this gives you smile in your face,

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Strangely enough I had this same problem last Wednesday. I at first thought it was the HDMI, as realistically no signal means not, "No connection" (check signal wire - bad cable) but means no data/no signal (bad send/no send).

Thinking I destroyed my pi while transporting it, I tried reposting the pi, checking the disk image, checked solderer connections, power usb in, even swapped the HDMI cable. I didn't have the luxury of testing with a volt meter or changing my display.

In the end, I found by wiggling the connection for the power input caused the screen to spark a rainbow colour and made the HDMI connection connect.

My untested theory is that: perhaps that when underpowered, the HDMI cannot fully enable, or otherwise provide enough power to operate a successful connection. Leading to a "No Data/No signal"

I tested this on another pi, and got the same results.

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My initial start-up 'problem' with my new Pi was No Screen Image - this simply turned out to be the HDMI cable connector not fully fitting into the Pi socket because I first fitted the Pi into an RS box bought to protect the Pi. Without the box everything worked: once I'd doctored the male connection (cut back the plastic encapsulation a tad) it all worked fine when back in the box. As a general rule - To succeed in life you need good connections.

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If you are using NOOBS to set up you PI, you might want to check the INSTRUCTIONS-README, that comes with NOOBS. This did not help me to fix it, but might be worth a try anyway:

If your display remains blank, you should select the correct output mode for your display by pressing one of the following number keys on your keyboard:

  1. HDMI mode - this is the default display mode.
  2. HDMI safe mode - select this mode if you are using the HDMI connector and cannot see anything on screen when the Pi has booted.
  3. Composite PAL mode - select either this mode or composite NTSC mode if you are using the composite RCA video connector.
  4. Composite NTSC mode
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protected by goldilocks Jun 25 at 13:47

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