re: Computer turns on randomly
Wednesday, November 22, 2006 at 11:12 am
Posted by C K
(6910 messages posted)
It's a hardware issue, not software. When the machine is powered down, only the
BIOS code is able to power up the machine if it is set to do so. The other more
common issues would be needing a BIOS update to a failing powersupply, motherboard,
or incoming power noise, spikes etc (should have a good UPS with a line conditioner
between the wall and the machine to eliminate this possibility). I doubt you have
a bad start switch but that could be possible also. Since you built the machine,
make sure all of the motherboard supports (standoffs) and screws are in the proper
holes and not overtightened (or shorting) as this can crush the board layers and
cause all sorts of odd problems and failures.
If the motherboard has a defect in it, such as a connection sensitive to heat, you
can get expansion/contraction that can lead to problems also. I would lean in the
direction of trying a different PSU first then strongly suspect the motherboard if
you check everything else I have listed and nothing obvious is in evidence.. A note
on the PSU.. It supplies current to the motherboard at all times unless physically
unplugged or turned off at the switch. Some boards are sensitive to ripple or a
drop of current and a surge which can trigger a power up.. Good Luck!
On Wednesday, November 22, 2006 at 9:26 am, daryls61 wrote:
>Anyone have any idea why my computer turns on randomly? I power it down and go away
>for a while and I come back and it is on. It will also do this in the middle of
the
>night. I built this one from scratch and this just started recently.
>
>Things I have already checked:
>
>1. Checked BIOS and all "wake on's" are disabled.
>
>2. Ran full virus scan - no virus found - I use EzAntivirus.
>
>3. Ran full ad-ware scan with Ad-WareSE, Spy Bot and SuperAntiSpyware - Removed
about
>30 trackers but no dialers were found.
>
>4. Checked power management and could not find anything wierd.
>
>Recent changes to PC include:
>
>1. I have an MSI k8n neo4 platnum motherboard with MSI live monitor installed since
>the beginning. I installed Digicell, Core monitor and Infoview. I also uninstalled
>Digicell and Core view to see if they were the problem but problem still exists.
>
>2. I also just updated to internet explorer 7 which seemed to screw with my Maxthon
>browsers favorites. The icons in the favorites that had a avatar now have the same
>image as a shortcut to an uninstalled program has. Not a big deal as the link still
>works but annoying non the less.
>
>I realize it could be a faulty power switch but I was wondering if there was anything
>else I should try before fooling around with that. I also realize that I can turn
>the power switch off on the power supply and PC won't power on then but that is
>a pain to do all the time. Also, if I do switch off the main power supply, the PC
>wont automatically power on when I switch it back. I still have to press the power
>button on the front of the case.
>
>I use windows xp pro.
>
>Any Ideas??
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