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Consider NOT connecting your camera to your computer.
The best way to download pictures from your camera to your computer involves removing the memory card from the camera and plugging it into a card reader (either built-in to the computer or connected via USB or FireWire). This is likely to be faster than connecting the camera to the computer, and won't run down your camera's batteries.
Once the card is plugged in, it will appear to your computer as a removable drive. You can use the operating system's drag&drop facility to copy pictures from the card to the computer's hard drive, the same way you copy any other files. Or you can use any photo cataloging program.
I had this problem with a Sony Digital Camera once. The memory card was full and it would not power on. I replaced the camera and was preparing to throw it away and tried turning it on one last time and only then did it briefly display a memory full error then quickly shut itself off.
I erased the memory and afterwards the camera worked fine.
So, check and make sure your memory card isn't full. If it is unload the contents onto your computer, erase it and try again.
This should work for the A520. With NEW or freshly recharged batteries, remove the camera's memory card, then turn on the camera. You'll probably see an E30 error. Next turn off the camera. Next insert the memory card, and turn on the camera.
If the above doesn't work, the following blog outlines some other repair options for a lens error. They won't work for all cases, but they're worth a try if the camera's no longer under warranty:
Try removing the card and see if it will turn on with just the internal memory--or try different memory card if you have one.
Had a somewhat similar problem with a new 1GB card when I shut camera off while it was still saving an image. Camera would come on, take a picture all by itself and freeze up. After using a couple of other cards it magically worked on the bad card