Problem uploading Marlin with ramps connected to arduino (5 replies)

Hello guys,

I'm trying to set up a printer for arduino study reasons and so on. Bought the parts on ebay and while waiting the delivery, I literally read everything that i could in the "literature" that I could find. Yesterday I started to do an assembly, I made connections to test the motors and so on, and I came across a problem: every time I try to upload the marlin firmware with ramps connected in the mega arduino 2560, the following error appears:

Avrdude stk500v2_receivemessage () timeout
(Several times)
Avrdude: stk500v2_getsync (): timeout communicate with the programmer

The strangeness that is when I take off the ramps, I can do the upload to the arduino without problems... Other thing: conecting ramps again to arduino and conecting to it via pronterface, I can make a connection, but when trying to move any engine, it does not work

Here are my questions: Should ramps be conected to arduino to upload the software? If not, what could be the problem if the motors are not moving via pronterface? The wiring setup must be all motors endstops and whatoever or can i do a minimum setup to test only one motor?

Thanks in advance for whoever respond!