|"Replaced 4GB RAM Dell 530 won't boot"|
We can read. You are the one who created the thread and set the subject heading, so don't blame us if we seem to have difficulty guessing what you really did and what your problem really is. Rant Over.
Now to clarify things, You used a 4 gb USB flashdrive for the first time. After shutting down the system you experienced some startup issue that you tried to resolve by booting from your Vista setup disc. Q? Did you reinstal the operating system? In your post #3 you said "Once up, everything looked fine until I ran a Norton 360 Liveupdate"
Does this mean you successfully reinstalled VISTA or were you simply able to boot into your original system?
Exactly what happens now if you try to boot up? Do you get any display? Can you press F2 or whatever the appropriate key is, to get into BIOS setup?
Q.? When you used the USB stick, did you use the "Safely Remove Hardware" sequence before pulling it from the slot?
It would probably have been safe to leave it connected while shutting down but if it were pulled without the "Safely Remove" process then you may have sent a voltage spike through the motherboard and damaged data on your harddrive. This is a possible reason why your operating system would not reboot. Might be a red herring.
Try this. Disconnect your harddrive. Both data/power cables.
Try booting the system into setup. Will it boot? If no then some other hardware problem exists. If it will boot then shut down, re-connect your drive and then boot up using a bootable CD/floppy containing a harddrive diagnostic program and see if the drive passes the manufacturer's fitness tests.
If it will not even boot into BIOS with the harddrive connected then either the drive/cable is faulty or the drive controller on the motherboard is dead.
Goin' Fishin' (Some day)