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Thanks for many quick answers. I appreciate it.
The problem seems to lie in firmware installation which might have been not so successfull. Maybe my cheap CF card was corrupted.

Could anyone here suggest what I could do to fix the camera? I'd like to try something before I send the camera to repair shop. It's still worth of having it repaired.

KAI

Perhaps my 50 D camera would be alive now, if there hadn't been conflicting information about what firmware should be used?
Sensor cleaning error came after I succesfully downgraded my 50 D firmware. It's funny how that can trigger ERR 06

One page says firmware 1.0.8 should be used for 50D http://magiclantern.wikia.com/wiki/Unified/Install
Another page says firmware 1.0.9 should be used for 50D http://wiki.magiclantern.fm/install

I don't believe in this theory, but I'm not an expert.
I'm sure that no matter what software was put into camera, it should be possible to ge it removed and get the camera back normal.

This camera is 50D

did you
a) replace your battery?
b) check the button cell battery in your camera?

Yes I tried with three batteries fresh from charger.
Then about the sensor cleaning error ERR 06  and the button cell battery:
When I had sensor cleaning error (err 06), I removed battery many times. Soon I figured how to get around sensor cleaning error by opening and closing battery door while power was on, and then disabling automatic sensor cleaning function. The button cell battery works because it kept the time and date information before during battery removals. This was before ML was installed
ERR 06 appeared after I succesfully installed firmware 1.0.8 from 1.0.9 (downgrade).

I tried LED blinkin diagnostics program. I downloaded the autoexec.bin file to CF card and put it to camera and tried to turn it on but nothing happened. No led blink.

Should I try something else?

Hello. My 50D is dead. This is how it happened.

I managed to install ML and I was going through info screens on my camera's back display when my 50D suddenly turned itself off after few minutes. Battery sign was blinking on LCD top screen. I'm pretty sure I switched the camera off and then I took out the battery as I was afraid that some program loop might overheat my camera  and kill it.

Now 50D doesn't start up anymore. No lights, no response to any button presses. I found out things to do when camera is bricked:
-I took off lens, CF card, battery and small battery and also the lens. Then I put them back and tried to turn on the camera but nothing happened.
-I repeated previous steps and tried to power it up without CF card, but nothing happened
-I formatted the CF card and tried to start up my camera, but nothing happened.

Before I installed ML, I downgraded 50D firmware from 1.0.9 to 1.0.8 because http://magiclantern.wikia.com/wiki/Unified/Install   tells that ML works only with 1.0.8. After downgrading I got ERR 06 (sensor) every time I turned on the camera. Then I disabled automatic sensor cleaning. Then I tried installing ML without succes (not 100% sure  if I remember this correctly). Then I found out that I CAN use 1.0.9 firmware.  I se-install 1.0.9 back to my 50D, but sensor error ERR 06 was still there. I disabled it automatic sensor cleaning, and then I installed ML. Installation was success. I restarted the camera and started reading info screens and after few minutes my camera was dead

I believed the advertisement talk that "hundreds of professionals are usin ML and they have had no problems with it". I am a professional and I had my camera die...
Thank god it was not my 5D II!
Dear people of this forum, I count on your help to fix my 50D.

KAI