My Ge profile fridge stopped working. The ice maker, water, fridge, freezer, control panel with all the readout lights are blank. The only thing that works is the light bulbs on each side. I opened up the back to look at the control board and it appeared to be fine. The only thing that I saw was a lot of lent build up on the back. I turn power off to the fridge for a few minutes to try and reset but that did not change anything. What can I check prior to purchasing any parts.