Installed HD + Ram Computer wont start

Art Beatz

Registered
Hi, I've just installed an additional hard drive (500gB) into my G5 computer (it had 80gb) along with an addtional 2gb ram (it only had 768mB). When I start the computer, it starts up though I don't get any response from the monitor. The light on the front of the machine flashes brighter every 5 seconds. I've tried removing the newly installed HD and ram but it just does the same thing.... what have I done wrong?
 
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