Have u tried booting with only 2?
try with two then if it fails take the 2nd one out and try another and boot again
try to narrow down which it is.
memory is strange, ive had ram i thought was dead put in in another comp months later and it works.
With all due respect John, I am the head of IT and I have it on good authority. If you type "Google" into Google, you can break the Internet. So please, no one try it, even for a joke.........It's not a laughing matter. You can break the Internet.