Can't connect, help please

I built a makergear prusa mendel about 4 months ago. Was able to get as far as connecting it (to pronterface), moving the motors and as far as I know it was ready to extrude, although never went that far. Put it away, now getting back at it. Had to redownload all software due to formatting computer. When I turn the power the supply on I dont get any LEDs on the ramps. When I connect the usb I get a red light and flash of green and red twice and when I try to connect to pronterface the same leds flash again but does not connect. I can make the board blink using arduino software so I know the usb is connecting. Im getting 12 V when I check the power going into the board. Any ideas where to look next?

Anyone have anything I could try? Im stuck here.

Is your firmware loaded onto the arduino? If you loaded blink, you replaced your firmware and it will need to be reloaded.

How do I do that?

Never mind, figured it out. Thanks a ton.