Raspberry Pi not booting up

My Raspberry Pi has been running for weeks without any problems. All of a sudden this afternoon I couldn't log into it. I noticed that it wasn't running as I tried to log in through the serial port and this didn't work as it normally does.

I switched the power off and then on again in case it crashed for some reason. When I switched it on again, I noticed that the LED's were not flashing in their usual way. The pwr LED goes on but none of the other LED's light up.

I have removed all my external hardware and USB wifi module and this didn't help. I have also tried to reflash the SD card with 2012-10-28-wheezy-raspbian.img and 2012-12-16-wheezy-raspbian.img image. Both images didn't boot and I tried them on two SD cards that have worked previously.

I have also checked the SD card connector and it looks like the connections are being made. I have tried three different power supplies and two different USB cables which makes no change.

I am stuck as I don't know what else to check. If there are any other things that I can try any help would be greatly appreciated.

The sticker under the board shows the following. E2912RSV1.0B1.1

Thanks,
Greg

The only thing left for you to check is the voltage after the fuse F3. http://elinux.org/R-Pi_Troubleshooting# ... r_problems but you'll need a reasonably accurate voltmeter.

Unfortunately I don't have a multimeter with me. I have checked the Raspberry Pi schematic and as far as I can see F3 must be OK.

The PWR LED is connected to 3V3 which comes from 5V after the F3 fuse so this implies that F3 is OK.

Unfortunately I don't have a multimeter with me. I have checked the Raspberry Pi schematic and as far as I can see F3 must be OK.

The PWR LED is connected to 3V3 which comes from 5V after the F3 fuse so this implies that F3 is OK.

A red LED only needs 1.6-2.0V to light, so it's not a reliable way to tell whether F3 is misbehaving. F3 is a polyfuse, not a single-blow fuse. A polyfuse increases resistance rather than opening the circuit, so it can cause RasPi's 5V to droop to the point when it starts causing problems. A multimeter will tell you immediately if 5V is too low -- it's one of the most useful RasPi accessories.

Unfortunately I don't have a multimeter with me. I have checked the Raspberry Pi schematic and as far as I can see F3 must be OK.

The PWR LED is connected to 3V3 which comes from 5V after the F3 fuse so this implies that F3 is OK.

A red LED only needs 1.6-2.0V to light, so it's not a reliable way to tell whether F3 is misbehaving. F3 is a polyfuse, not a single-blow fuse. A polyfuse increases resistance rather than opening the circuit, so it can cause RasPi's 5V to droop to the point when it starts causing problems. A multimeter will tell you immediately if 5V is too low -- it's one of the most useful RasPi accessories.

Thanks for he explanation about the fuse. I didn't realise that. All my tools and test equipment is on a ship somewhere between South Africa and the UK so will have to wait for all of it to arrive before I get into debugging mode. Will just get another RasPi, cheaper than getting a decent multimeter

Will just get another RasPi, cheaper than getting a decent multimeter

£7.49 in Maplin will get you a very usable DMM. (Item code N15BY currently on special offer.)

getting frustated because of booting up raspberry pi............

applied methods.
1) tried with 5 memory cards with same image.
2) tried with 5 memory cards with different os images.
3)tried with 10 different microsd adaptors.
4) tried with two different power supplies.
5) tried with no device connected.
what can I do now.it is really frustration that all the possibilities are not working..I am thinking that throw my raspberry pi board.

[texy]

Hi and welcome to the board.
You'll need yo give us more info than that
How are you producing the SD card?
What exactly is display on the TV/monitor?
What is the condition of the LED's?
How are you powering the Pi?
D oyou have a powered usb hub?
Texy