Thanks for your response srsa_4c,
Yes, the 220 has died (foreign objects floating around inside it) and the whole episode trying to use chdk with it gave my a**e a headache !!
I have a 170 ordered because I loved the ixus's versatility, however, I may purchase
another model should I find one that is better/more easy to use with chdk.
I'd like to use chdk primerily to experiment with time lapse