Wasnt doing anything too strenous on my computer and all of a sudden my two monitors went into 'standby' mode. My PC was still on and the fans were making noise, but the monitors were sat there as if there was no input. The sound continued for another few seconds after this but eventually went dead too. I tried rebooting my computer 2 or 3 times and the monitors would not switch on (so there was no input). I left it for 10 minutes or so and tried it again and it booted up fine. I shut down the computer and went to watch a TV program. Ive tried to boot it up multiple times now and each time the computer switches on (fans whir etc), there is no monitor input and then after about 10 seconds I get (what I think is) a single long beep last about a second (is that long?) Google searching led me here and to the beep guide, but I cant find my motherboard in there. Its a gigabyte PA55M UD2. Ive d/l the manual from their website but there is no information in that manual about the beeps. There are 4 lights on my motherboard that say 'phase' above them. 3 of the lights are amber and the one numbered 4 is red when I switch the PC on. After the beep, these lights turn off completely. The manual suggests these lights are something to do with the CPU but doesnt mention much about it. Any ideas? I appreciate any and all help. Additionally, when the computer boots up I dont always get a beep. Sometimes it just sits there whiring with the amber/red lights on the motherboard until I power it off.