HOW did this become my fault?

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ok, hi mylotters and friends. I need your input on this one for sure. Ok my sisters' HP laptop no more than 8-9 months old from best buy cuts on alright but cut off all by itself. it will just shut off right in the middle of anything. so sometime last week she asked me to take her laptop to a well know guy we call "the computer guy" with is own personal business and fix computers. ok so i did just that. put there was a $40 deposit that need to be paid up front. My sister knew this. to make a long story short. she paid the deposit and the guy bascially did not know how to fix the computer. she got mad at me because i didnt see the sign on the door that says the deposit is non refundable. i didnt see it because i wasn't looking for it. is it really my fault??? i mean she still would have gone and asked him to try to fix it anyway. so i don't see why she is mad at me.