Need some advice. Not sure y every time i built a desktop and later in the future (maybe a year and half) i always get a "no signal" to monitor not even a POST start-up. I know within that time period, I sometime remove dvi cable so i can fix friend(s) pc since i only had one monitor. Is it because of that and cause video card not sending signal to monitor? or it's the motherboard. I did re-seat the memories and still no signal to monitor. No any kind of beep. Sometime when i move video card left/right, it works and hear one beep then that when i get signal to monitor. Now, nothing. No beep, no signal, no POST. Just dark screen. Please help me why? and how to prevent in the future. Thank you ASUS P7P55D-E LX Inil Core i3 550 3.2GHz socket 1156 Sapphire Radeon HD5670 512MB 8Gb (4 slot and each slot is 2Gb) All 4 slot is listed below.