Hi Irvine, I have seen interoperability problems between the ENP-2505/6 and some varieties of DELL systems. These problems seem to be related to the Primary lockout bit on the 21555 non-transparent bridge. One quick thing to try, If not already set to 1, change the bootmanager countdown to 1 and try again. Otherwise often another type of backplane (even other DELL systems), and more up to date BIOS may fix your problem. To: "'ixp1200@cs.princeton.edu'" cc: Subject: [ixp1200] ENP-2505 fails to work with Dell Optiplex GX260 Hi, I get an ixp1200 board from Radisys, ENP2505. But it can not work with my PC, a Dell Optiplex GX260. When it's plugged in, the machine fails to boot, but resets endlessly. The chips set of the mainboard is Intel845G. Does anyone have any idea? Regards. Irvin _________________________________________________________________ Unlimited Internet access for only $21.95/month.  Try MSN! http://resourcecenter.msn.com/access/plans/2monthsfree.asp