Hi there- I'm new to this forum, but I have heard it is informative. I have a used Ascend Max 4000 that I bought used from a friend's ex-boss who runs an ISP. It came with (3) MX-SL-16MOD-S56 modules. When I received it, it booted fine, and I was able to serial console into it with no problems. I put it into the rack w/ all of the other routers and plugged the ISDN connection into it and began configuring it, then got called away to another project. It stayed there powered up for about a month, when I came back to it. It now will not boot if any of the 16MOD modules are plugged in. If I remove them, it boots fine. The documentation is somewhat lacking for troubleshooting this device. I'm a Cisco CCNA and usually can figure most anything out, but I can't get a handle on this one. Any ideas? Thanks Brian Robison ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com **********************************************************************