Invalid device signature for ATtiny84 SOIC package

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i'm using uno program attiny84 (soic) arduino isp, , i'm getting inconsistent results.

first, successful in programming 1 attiny simple blink program testing. however, can't seem program one. following error:  avrdude: yikes!  invalid device signature.
         double check connections , try again, or use -f override
         this check.

i think might know problem, before taking ton of time test out i'd feedback. successful case, chip connected single led. unsuccessful case, chip connected various other components (potentiometers, amplifiers). can these other components possibly affect isp process? if schematic helpful, can provide that.

any appreciated. thanks!

the app notes avr chips recommend series resistor on spi lines if there other spi devices present, prevent conflicts of interest while trying program. perhaps there going on.

chuck schematic on here!


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