Pc keeps re-booting after shutdown?

[mad mark]

When I shut down my pc it keeps turning itself on again. It shuts down as normal, waits a sec or two then turns itself back on?
I have to turn off the mains power just before it starts up again.
Nortan I.S. is up to date with regular system checks, I run Ad-aware SE on a regular basis too. I also defrag regularly too. (I'm using XP pro)

Not sure if this was a coincidence but, it seemed to start after I installed my router (Belkin). It did it occasionally then stopped, But now it does it everytime.
Its a real pain in the butt!!

Any Idea's?
Mark.

[JoolzB]

This isn't much help but my PC did that when it didn't like a DVD device I'd installed, booted up, worked fine but then rebooted after a while. It may be worth trying without the router installed to see if the prob goes away?

[neil_cardiff]

Usually to do with Power on LAN being enabled and the router pinging the machine, and the machine thinking its time to turn on.

Make sure you have Wake on LAN disabled in the BIOS

[zcacogp]

Not sure if it is of much help, but I had the same when I installed a wireless access point (WAP) as well. (Netgear, in my case.)

It has the usual 10/100 connection, but also a USB connection which allows you to configure the WAP using a bit of software on the PC. I found that if I left the USB wire connected then the PC would always reboot as you have described.

Remove the wire, problem solved.

Let us know what solution you find.


Oli.

[mad mark]

neil_cardiff said:

Usually to do with Power on LAN being enabled and the router pinging the machine, and the machine thinking its time to turn on. Make sure you have Wake on LAN disabled in the BIOS

I've got "VIA Onboard LAN" [enabled], and "On-Chip LAN Boot ROM" [disabled].
These are the current settings, I couldn't find Wake on LAN????


I'll try unplugging the router from the pc tomorrow to see if this helps.

[mad mark]

Ok, I just tried unplugging the router lead from the back of the pc and it still keeps turning on.

[zcacogp]

mad mark said:

Ok, I just tried unplugging the router lead from the back of the pc and it still keeps turning on.

Sorry to hear it ... was worth a try.

Oli.

[neil_cardiff]

mad mark said:

neil_cardiff said: Usually to do with Power on LAN being enabled and the router pinging the machine, and the machine thinking its time to turn on. Make sure you have Wake on LAN disabled in the BIOS I've got "VIA Onboard LAN" [enabled], and "On-Chip LAN Boot ROM" [disabled]. These are the current settings, I couldn't find Wake on LAN???? I'll try unplugging the router from the pc tomorrow to see if this helps.

Ok, do you have a USB keyboard? I had this when I had a USB keyboard installed...

Never quite worked out why...

[ErnestM]

Look in the "Power Management" section of the BIOS. A lot of more modern systems include and option for what to do if your system loses power. One of the options is to "Power On" or even "Previous State". See if you have that option and if you do change it to "Power Off" (or something similar).

Sorry to be so generic but I have no idea what type of BIOS you have.

ErnestM

[mad mark]

I do have an optical Keyboard/Mouse connected via USB, but i've had this for a while, so cant see this being an issue??


I will have a look in the Power management tonight when I get home from work.

Thanks,
Keep the suggestions coming in guys

[mad mark]

ErnestM said:

Look in the "Power Management" section of the BIOS. A lot of more modern systems include and option for what to do if your system loses power. One of the options is to "Power On" or even "Previous State". See if you have that option and if you do change it to "Power Off" (or something similar). Sorry to be so generic but I have no idea what type of BIOS you have. ErnestM

I've looked through my power management part of the bios and think i've found what you are talking about.
Its called "AC BACK Function" currently set to "Soft off" which is the 'always in off state when AC back' mode.
So I think thats where it should be.

However, I do have two other settings i'm not sure about?

1. 'PME Event Wake UP' and 2. 'Modem Ring Resume'
Both are set to Enabled. Should I disable these?

[ErnestM]

mad mark said:

ErnestM said: Look in the "Power Management" section of the BIOS. A lot of more modern systems include and option for what to do if your system loses power. One of the options is to "Power On" or even "Previous State". See if you have that option and if you do change it to "Power Off" (or something similar). Sorry to be so generic but I have no idea what type of BIOS you have. ErnestM I've looked through my power management part of the bios and think i've found what you are talking about. Its called "AC BACK Function" currently set to "Soft off" which is the 'always in off state when AC back' mode. So I think thats where it should be. However, I do have two other settings i'm not sure about? 1. 'PME Event Wake UP' and 2. 'Modem Ring Resume' Both are set to Enabled. Should I disable these?

Anything that "wakes up" your computer should be disabled in the BIOS until you find the cause of your problem. Basically, what appears to be happening is that your computer is powering down and then an event is trigerring a power up. Most modern systems keep power going to the bus so that the BIOS can use "wake up" events (timers, modem calls, keyboard strokes, lan wake-up, etc, etc)

By the way - I think what you have found the BUTTON function with the "soft off" option. What motherboard do you have? Maybe I can find a manual on line and give you exact steps to get into the deepe power management functions...

ErnestM

[mad mark]

Well I know i'm about to shoot myself in the foot, but,....
It would appear that after I disabled the 'PME Event Wake UP' and the 'Modem Ring Resume', my pc has now stopped turning itself on.
Thanks for the help guys.

[zcacogp]

mad mark said:

Well I know i'm about to shoot myself in the foot, but,.... It would appear that after I disabled the 'PME Event Wake UP' and the 'Modem Ring Resume', my pc has now stopped turning itself on. Thanks for the help guys.

Good! Glad to hear a happy outcome.


Oli.