I have an HP a14103 running XP. For some reason when I put my computer into stand by, it wakes itself up at random with no discernable pattern. I have checked my automatic updates and antivirus setting and they don't seem to be the source of the problem. I don't know how to go into and read or correct anything in the BIOS (but I'm impressed with myself for knowing that term!). I tested the system last night by going into stand by and waiting until after the screen saver was set to start to see if that could be what woke it up but that wasn't it. I've set the mouse to not wake up the computer in case it gets accidentally jogged enough to trigger a wake up. The computer is set to allow hibernate in the power settings. I've moved most of my downloaded files to an external hard drive and I disconnect that when I go to stand by in case one of those files has something embedded in it that could cause the computer to wake up. I've run a complete scan and registry cleaner. I still get the same problem.
Any help would be appreciated! I do completely shut the system down about once a week, but for daily use I prefer to go to stand by just since it's so much faster than waiting for it to reboot.