so i just upgraded my mom's computer with a newer motherboard, processor, memory, and power supply...problem is, whenever i try to start it up, i get one long repeating beep...ive checked all the connections, reseated the memory, reseated the video card, replaced the keyboard, changed the power cable, and pretty much checked everything out short of changing out the hard drives...and im out of ideas...anyway got an idea what the problem could be?...im not getting any video either...