Have you checked 'Control Panel' 'Display' 'ScreenSaver' and set to 'blank' 'wait seven minutes' this can seem as though the computer is going into standby mode.
When you say, 'There seems to be quite a few power options in my bios '. Let the forum know what these options are as we dont even know what BIOS you have onboard your computer. All these BIOS setting's can point to a problem that the experts here can resolve.
Thanks - the screen saver is set to XP, and 10 minutes. I know the pc is going into standby as I see it doing so whilst I am using it - so it isn't just the blank screensaver.
OK, so all day it's been doing this standby thing, yet since 6 pm it's all OK. Very strange behaviour - have scanned for viruses, nothing. I will try and post some more BIOS info if anyone can help and thinks it could be that..?
Ok, if anyone can help further here are my Power Management Setup BIOS current settings:
ACPI Function - Enabled Modem Ring Resume - Disable ACPI Suspend Type - S1 POS C2 Disable/Enable - Disabled Power Management Option - User Define HDD Power Down - Disabled Video Off Option - Suspend>>Off Video Off Method - V/H Sync and Blank Modem Use IRQ - 3 Soft Off by PWRBTN - Instant- Off Power On by PCI Card - Disabled RTC Alarm Resume - Disabled
Could altering any of these help perhaps? Thanks to anyone who is helping me!