I have a friend's computer to troubleshoot. Connected it all up and tried to boot up, got the initial beep, but no response from the monitor. After 10 seconds or so, got 2 beeps, followed by one beep. Tried removing the video card, reseating RAM, clearing CMOS, but still get the 2 beeps followed by 1 beep. Manual does not indicate beeping patterns. Does anyone know what failure this code represents? Thanks.