After i had taken a photo, the camera just turned off and left the zoom lens out. I tried to turn it on again but it didnt, even after i charged it. Whats wrong??

Hi there the question is not much clear. But i will inform you 1st the if you connect the USB with camera you can't operate the camera for photo taking . So zoom not working. But if you mean that as normally when you try to click photo with out USB connection but that time zoom or lens not working then try to do this.
Please follow the steps and let me know the result.
1. Ensure batteries are fully charged & clean the battery connector point in side the battery compartment.
2. Look carefully between the lens and the camera body for any sand, dirt or any damaged etc.
3. Try turning the camera with the lens facing down and shake to dislodge anything stuck
4. Try removing batteries and memory card, wait 5 minutes and refit the battery only.
5. Now turn on camera( with out card ) and see ,if working then fix the memory card & again turn on the camera. If working then fine . Otherwise format the memory card and fix back in camera again & try. Make sure before format the memory card take a back up all photos in your computer then format. If no luck then reset or restore the camera setting by pressing Menu key for 2 sec .. in not done the press both Menu & self time key for 2 - 4 sec.
i hope it will gives you success.

Hi!
It sounds like that the shutter cable inside lens is partially broken. It moves with the lens while it zooms, so it could loose contact while stretched - when you have zoomed the lens. Z750 and Z850 have this problem with shutter cable - it breaks. The white horizontal lines are because shutter doesn't work. I'm afraid the cable will brake soon and pictures will be too bright with white horizontal lines even at normal zoom. It is considered a hard repair - the shutter part or whole lens unit has to be changed. You can contact your local Casio service center and ask the price, but it will probably be very high. I work in a Casio service center and new lens for this camera costs about 250$. It's not a good idea to put on used lens or shutter, as it will brake again sometime - it's just a matter of time. I suggest you get another camera.

Hope this helps!

Tom

You have a bad lens. Unless the camera is in warranty the cost of repairing the lens is higher than the value of your camera. The strange noise you hear is the lens motor trying to move the lens. One solution is to blow compressed air around the lens. Sometimes dust and dirt may jam the lens.

To save battery power, the camera automatically goes into sleep mode and the monitor turns off if there is no operation when the camera is turned on (when the lens cover opens and the monitor is on). No picture is taken even if the shutter button is fully pressed in this mode.
Operate the zoom lever or other buttons to restore the camera from sleep mode before taking a picture. If the camera is left for 15 minutes, it automatically turns off (the lens cover closes and the monitor turns off). Press POWER to turn the camera on.

It sounds like you have a damaged zoom servo.. which is odd because you're camera probably extends the lens once it's originally turned on. The motor/servo is kind of expensive to replace and it may be more cost effective to purchase a newer camera. 
To make sure i'm correct. try turning your camera on with your hand over the lens to stop it from protruding. if you get a similar or the same message then it's the motor. If it just beeps then i have no idea what the issue is. Has the camera been dropped recently?

1 year warranty on olympus products, but does not cover physical damage such as impact, water, or sand

dislocation of motor drive gear / need to fix by near camera technician.

i am having the exact problem as you are having have you figured anything out? Thanks!

Your lens assy needs replacement, thanks

Sounds like zoom has sand in it, Or the camera may have taken a hit to the front of the len's, Lens has to be taken apart, Has to be done buy a camera repair shop/or factory. TC