Your Canon A75 has problem of bad ccd imager sensor and this part will be replaced free of cost by Canon if you are in the USA I believe. However, if you are in the UK I don't think you'll be so lucky. Worth contacting Canon to ask but when mine went I binned the camera and bought a Panasonic DMC-FX30EB-S Digital Camera - Silver (7.2MP, 3.6 x Optical) Antishake, 2.5" LCD with a lithium-ion battery. No more short battery life now either.
Chicks Fan, December 2008