I'm new to this forum Im looking for help with my iMac 2007 model. I was given a gateway tft19w80ps+ monitor and I used it with an old macbook pro 2006 and it works fine (mothers Mac) and I own a 2007 imac I bought a Mini dvi to dvi adapter and hooked the gateway to my imac and nothing happened same cable as I used with the mackbook pro so I know the cable works I tried an smc and pram reset but nothing got fixed. I reinstalled mountain lion still no luck nothing worked I'm at a lose I need help. The imac shows it sees the gateway just no picture shows on the gateway monitor except for the no signal keeps flashing on it randomly from time to time. I tried calling apple but they are going to charge me for phone support. Grrr not liking the results help of any kind would be apreciated. I did an SMC and PRAM reset. something I'm missing.