Welcome to the forums.
I think that it's good news you've got a light blinking on the Seeeduino (in fact, the blink sketch may have uploaded once) but obviously somethings going wrong now.
Could you try the upload with the power switch on the Explorer PCB set to off? The Seeeduino can be powered from your PC using the USB cable and there may be some problem with wires connected to th Explorer PCB.
Also, how far have you got with connecting the wires from the Explorer PCB to the Seeeduino? If it's not too much hassle could you try disconnecting wires to see if that makes things work?
Regards
AlanStatistics: Posted by Alan — Fri Dec 26, 2014 11:40 pm
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