Same exact problem in my A57 its common. I tried a $5 SD slot cleaner (see Amazon) but it didn't work. Photo Tech Repair Service (360 W 36th st, NYC) charged me $27 to tell me the main circuit board is bad (apparently some cameras have a separate SD component, but not so for this model- its all 1 part). Estimate, parts $195, labor $160, tax $29 minus cost of estimate, exceeds value of camera . Im hunting for a cheaper repair service. Any suggestions?