In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote: Does the SX-Key header have 5 volts on it ? Make sure the MCLR pin is NOT held low. Can you program a new SX protoboard ? Just soldering header pins by itself should not make the SX not program. Bean. ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=144222#m144256 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2006 (http://www.dotNetBB.com)