There could be a number of problems regarding your concern. I would start by removing everything except for the PSU, CPU, HSF, and system speaker. With this setup, turn on the power and listen for beeps. If you hear one long beep, followed by two short beeps, this will rule out bad memory slots.
If it turns out that the memory slots are good, try moving the memory stick to another slot and retry the boot sequence.
As for your "noob question", the answer is yes and no. Yes if the single stick you have is bad. No because your system can operate with video on only one stick. Furthermore, we were all beginners or noobs at one point, so never be afraid to ask.