|HP xw4600 Workstation (acquired used), 4Gb RAM, Intel Core2 duo core CPU.|
Win Vista Business SP2, 64-bit OS, all relevant updates installed.
When this computer is in sleep mode, it seemingly goes through a hardware reboot every 2min 20sec (+/- a second or so). The power light on the front panel goes off, all the fans shut off (including the power supply fan), and the box is utterly silent for 3-4 seconds with the power light blinking on / off slowly, and then the power light comes back on, fans start back up, DVD drive light comes on as the drive is being pinged, and so on, then it's right back to sleep mode. The monitor does not wake up during any of this activity.
Software-wise though, it's as if nothing happened. When I wake the computer, Windows is still up and running with the desktop exactly as I left it. The software did not restart in any way.
Any ideas what is going on here? I've not found any reference to this in my online searches so I assume it's not a prevalent prob with the OS or with the box. Is this constant 'restart' shortening the life of any components? Thanks for your input
Edit to add: Numerous anti-virus scans and anti-malware scans with different products have returned a clean bill of health.
message edited by dabuttery