I have an AMD Athlon XP machine. The computer was not maintaining time nowadays, but I never bothered to look into it. I switched off my comp day be fore yesterday and when I tried to boot it yesterday, the red light on the CPU turned on , but the green light on the monitor just kept flashing but did not turn on. I tried my CPU with another monitor, but the same problem persisted. I thought it could be a CMOS battery failure since my computer had constantly been loosing time. So, I replaced the CMOS battery. After this, I got a message saying the BIOS settings have been set to default. After this, I logged into windows and left the system on thinking that it could help the CMOS battery to charge up since it was a new one. I went out for 5 mins and by the time I came back the monitor was again blank and the green LED was blinking periodically. I replaced the RAM but to no use...What could be the problem???