Mod, Please move to the right section if I have posted in the wrong section. Thanks -------------------- Need some professional help/opinions from those who are in this business and I am sure there seem to be many who KNOW about their photography. Here is what happened. I posted earlier about upgrading to a Canon 50D, from a Nikon D40x, with a bunch of equipment and glasses. I just got my camera body and I keep it very close to me and baby it since. Just last night, I got a HUGE scare!! When I tried to turn on my camera, nothing happened! Literally nothing happened. I called my friends up who have been using 30D and 40D for a few years now and they asked if I have received any error message and I said NO and that I cannot even turn on the power. The little red light thats just at the bottom of the large dial did not get turned on (as it usually would for a second or two when the camera is cleansing the sensor). At first, I thought it was my battery went completely DEAD, so I took out my 2nd fully charged backup battery (OEM canon battery), and I still cant turn on. I took my friends 50D camera battery out and use it on mine, and I still cannot turn on my 50D. Now, I put my battery in my friends 50D, it works and I do have full charge on both of my OEM batteries. Now, I was like, "fuk, I just got this baby like literally one month ago and it broke down on me!?" I was all ready to get out my warranty and about to make a phone call.. Then, my 30D friend said, lets try to isolate the issue first. So, we made sure it was not the battery. Then, we tried to switch different lens, as we thought it might be my EFS 17-55 f2.8 lens. So I tried my friends 17-40L, and my camera still cant turn on. Then, I took out my 16G CF card (some digiExpress brand I have never heard of that came with the camera), and inserted my backup Kingston CF card, still did not work! Now, after about 5 min of trying other things, I put back my 4G backup card, my 50D now turns on!! (what a relief at the time). So, now works. Long story short, I went back and insert back that 16G CF card, my camera does not turn on again!!!! So, we quickly inserted back the 4G and still cannot turn on. We could turn on after aout 3-5 min.. and then camera is back on... So, at the end of the night, we were 95% sure it was the CF card that is "short circuiting" my camera? My 30D friend said that he knows that if a bad CF card is inserted, the 50D would give you an error on the LCD screen or some sort of message. BUT, he has never heard of inserting a bad CF card and the camera body wont turn on issue! anyone has or heard similar issues? I'm still pretty new to this newly found hobby of photography.. Thanks PS. I just found this site and seeking for some help.