A few weeks back, I had the four beeps and amber light on my 8300. Following forum advice, I reset my memory into their slots and trying booting again. This time, no four beeps, but amber light and the screen still blank.
I had to go away for a while, and when I tried again on my return, I was getting the four beeps again. Reset memory once more, but this time it remains along with the amber light.
The four beeps is a memory failure like you've read before. If you have more than one memory stick, try isolating it down to a certain stick. Like having one stick in and turning on, then swapping for the other stick.