The Camera will not work, even if the battery is fully charged

What kind of camera is this? I suggest calling the company such who will take time on the phone and work with you to fix the issue. Didn't have the same problem but have a Nikon and they assisted me over the phone almost an hour working with me to solve the issue.

That's what I would say. Exchange it for a new one.

Well you mentioned that it worked fine yesterday with the battery out of the box. That should tell you that the camera and the battery are both fine. The issue is likely the charger itself. Try recharging it again, and double check that you inserted the batteries correctly, and that any switches (such as for 2 or 4 battery charge) are set in the correct position on the charger. If this doesn't work, take the charger back to the store for exchange/refund as defective.

Thank you for such a detailed description, wishing others would take your lead. To the problem camera designated batteries (other then AA rechargeable) have always been a bit of a sore spot for me because the user is compelled to purchase a specific battery. As much as I prefer the name brand accessories for the camera there come a point where you just gotta venture forth with third party accessories. There is nothing wrong with using an "off" brand in fact what I've found is that is some cases they are a better battery. Again back to the problem. I grasping thoughts on how to word this but, here goes. As much as the manufactures would like you to believe that these batteries do not form a memory they do. Also the battery can trick you into thinking it's fully charged when in fact even though the charge light is saying completed it's only got about 1/3 charge. I've worked with Canon's BP 511 and now the "new" BP 511A for many years The BP511A or equivalent is the better battery. What needs to be done is to drain those batteries down until they stop, let it cool don't take it from the camera to the charger. Time the battery when you put it on the charger, meaning not to the second but what you would "normally" do is plug the battery into the charger and leave it right. Well what's possibly happening is that within ten minute the ready light is coming on, (something stupid going on in the battery) So check the battery stat of charge after say 15 minutes and if it says it ready (drum roll please) remove the battery unplug the charger for a few seconds and place the battery charger back onto the wall outlet and plug the battery back into the charger and look at your watch again. I've had to do this as much as three times until the thing would get the idea it was to take a charge "normally" about 2 hours will bring it back up. There is no device I've found to completely drain one of these batteries so over a period of time in your case one year the batteries begin this fit. I've since replaced the BP511 for the better BP511A's or equivalent. I'm not pointing a finger because myself and staff do the same thing and pull the battery before going to a shoot if it's showing partial discharge and the thing gets put onto charge and we start this cycle all over again. Be careful of the charger as well meaning don't just disconnect the battery and put it back on charge when it's going the cycle thing disconnect the charger from its power source as well because it holds a memory for a few seconds and will just shut off in a few moments if you don't.

Long story but I've been doing this now for 9 years since the dawn of Canon's 30D Cheers

Same thing happened to me a while ago. I was in a panic. I turned it on and off several times...no change. Finally, I turned the camera to the off position, took the battery out of the camera for about 30 seconds and put it back in again and it worked fine. No problem since.

You're using the wrong batteries. You need to purchase lithium batteries. They are quality batteries for high powered, battery operated electronics. Personally, I have a battery charger and use rechargable duracell batteries. (HR6/ DC1500/ NiMH/ 1,2V) Gives you approximately 16 hrs before having to recharge.

Make sure you have either a fully charged batteries or a new batteries.
Could be some internal problems such as loose connections.
Camera sounds like it needs repair. Repair for this camera, due to age may be beyond what you would want to spend.

yes it works fine, even with the battery in and plugged in it works, if the battery has a charge i can unplug it and it works fine. the camera will just not shut off.

The camera was working fine 5 days ago. Yesterday when I tried to switch it on, I assumed that the battery was flat so I charged it but when fully charged the camera still won't switch on. i Please help!

Are the batteries FULLY charged?
This has happened to me!