intel Imac will chime when started but screen is blank.

[biomurph]

Reseating and swapping out the RAM did not work. The screen is still blank. Any thoughts on what to do next? Should I assume a motherboard is to blame?

[djackmac]

Next is to start disconnecting things and testing. Take apart is required here. Disconnect HD, optical drive, airport card, bluetooth, etc..Disconnect everything until you get down to the logic board, power supply, and maybe the display. Even try disconnecting the display because there is a chance the display could be causing the issue. If you get down to the logic board, power supply, and RAM and there is no change, then you can safely assume its the logic board.