PS3 problem

I just had my PS3 fixed again from yellow light. Made them put it on in front of me i worked. I get home it goes on but I get no picture. Has the now picture ever happend to anyone? I am hoping they just changed my video settings to hdmi and if they did does anyone know how to switch back to sd? I only use the yellow red and white that it came with.

Thank you in advance.
 
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