Jim Duda <jim@xxxxxxxxxxxx> writes: > When I install the second DIMM, the BIOS properly recognizes it, > however, FC5 won't boot properly. The boot time takes forever. The > bootup is sitting in "Starting UDEV" for a very long time. This is not an uncommon occurrence. Adding memory increases the memory-bus loading which slows the signals down a tad. Your board may not work reliably unless you add an extra delay state to the memory access in the bios. I'd download memtest86 and run it overnight and see if that catches any error. http://www.memtest86.com/ If it does find errors I'd bump the timings up until the errors went away. Even if memtest86 doesn't find any errors for cpu->memory transfers there may still be some device->memory errors. Bumping the timing anyway may make them go away. It is one of those cases where you have to experiment a bit and see which of the memory timings need just a touch more time. -wolfgang -- Wolfgang S. Rupprecht http://www.wsrcc.com/wolfgang/