You need to update your bios, then try to boot again witht the new sticks you purchased. If this doesn't help you PSU may be the culprit.
BTW what are your specs
How do I update the bios? Sorry, I'm computer illiterate.
I have an older computer package from dell, the thing is about six years old. I tried looking up my service number on the dell website to see the components but it's not very helpful. I'll copy paste what I know is still there.
PROCESSOR..., PENTIUM D PRESLER..., 930, 3.0G, 2X2M, C1
DUAL IN-LINE MEMORY MODULE..., 1G, 667M, 128X64, 8, 240, 2RX8
what else should I include? i have newer sound and video cards, and i think the psu is 750w.