System cannot boot

huh that is odd, you might want to try f8ing the start up and running "Last know good configuration that worked" or you could try booting it in safe mode. You also might try reformating the drive you installed the updates too. Another thing that can cuase it is your RAM you might try booting with only one stick of RAM in. Try thoughs and let me know what you found out

this is not really odd one of the drive is creating a faliure or the printer is the culprit
disconnect all the drives and see it should go the screen that says no boot device found
than connect one by one
and you will find the culprit drive
before doing this try disconnecting the usb devices and start the computer
if this works disable the usb emulation from the bios it would be under onboard devices

and regards the other issues listed in the same query
the guy with c and d ember
remove the memory cards and put it again
if u have a dimension 2400 remove the cpu heatsink and put it back