I have the same problem - 4 fast beeps and it turns off. My guess is that the lubricants are getting old and sticky - I had a Canon SLR that developed the same problem after being in the extreme cold. Here's a couple of things to try:
You can still access the picture review features by holding down the review button while you turn it on (note that if you hold down the trash button you'll see the firmware version.)
What doesn't work: Resetting the camera from the setting menu; replacing the battery, replacing the SD card, cursing.
I've been able to consistently get it to function normally by hitting the camera into the palm of my hand on the left side (with the viewing screen facing you), just after turning on the camera. If this doesn't work, keep hitting harder until it works. Once on, the camera works normally.
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Here are the steps for the no power problem: 1. Make sure you will install a new or fully charged battery/batteries into your camera. Please use lithium batteries Ni-Mh or rechargeable Batteries (2000 M.Amp or higher). 2. Clean the battery contacts. a. Remove the battery/batteries and the memory card from your camera, then wipe the battery contacts with a soft, clean cloth. b. Reinstall the battery/batteries into your camera 3. Turn on your camera without the memory card. (If it works then it?s your memory card that is faulty)
This is usually a low/bad battery problem. Remove the batteries from your camera and make sure the battery and camera contacts are clean. If using alkaline batteries, try a fresh set. If using rechargeable batteries, recharge them for several hours. If a recharge doesn't work, you may need a new battery set. eBay is a good source for reasonably priced replacement batteries.
I have the same problem with my camera and the following activities solved it. Remove batteries and clean contacts of battery's host (include cover). Check as well that contacts are not bended and didn't lost their springiness.
Good luck !