Dell Inspiron 1545 always restarts instead of shutdown on AC power

Hi

I have a strange problem here with my laptop. It has started to always restart when I ask it to shutdown. The shutdown process works as normal, but after the machine turns off it stays off for about 3 seconds, and then turns back on again.

I have tried the following things:-

    Updated the BIOS to the newest version
    Disabled all Wake on Lan options in the BIOS (none were set)
    Reset all Power Management Options to default
    Looked in the event log and cannot see any issues
    Updated all software
    Installed Secunia PSI and updated any software it highlighted had new versions
    Ensured all Windows updates were present
    Gone to Dell's website and looked for updates to drivers for LAN hardware - none found
    Checked to see if I had any Nvidia drivers installed, none found - uses Intel integrated GPU
    Reset the BIOS to defaults

I'm struggling for ideas now. Anyone have any others to try?

These issues only happy if the laptop is plugged into AC power. If the laptop is shutdown when using battery is shutsdown properly, and stays shutdown even if the AC power cord is restored.
threepeAsked:
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BitsBytesandMoreCommented:
You may want to remove the hard drive temporarily and test the computer with the Dell Diagnostics. It will allow us to eliminate variables. It seems to me that you have a bad power adapter but it could also be a bad motherboard. Let me know the results of the Dell Diagnostics.

Bits...
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BitsBytesandMoreCommented:
If you are unsure on how to run the Dell Diagnostics or want more information regarding its enhanced uses, you will find it all at: http://www.cs.utexas.edu/users/deke/laptopsupport/manuals/d600/diag.htm

Bits ...
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Mez4343Commented:
Do you have Windows Automatic Update turned on? If yes, it might be restarting your computer to finish an update. Try turning Auto Update off and see if behavior changes.
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threepeAuthor Commented:
OK, harddrive out of the machine and the problem persists.  So that is the end of it being a Windows Vista issue.

So long as the computer is plugged into the AC adaptor I cannot turn it off.  Pressing the power button "turns the machine off" but the power light stays on, and a few seconds later the computer comes back to life.  

Holding the power button in does not work either.

Dell system test passes up to the memory test, where I cancelled the test after 20 mins of no error.

I'm going to pop the CMOS battery to reset that to see if that has an effect
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BitsBytesandMoreCommented:
I figured it was a hardware issue. It did not seem like a Windows problem.

Most likely it's the AC adapter but it could be a problem with the motherboard as well (unlikely since it seems to be working well when the AC Adapter is unplugged). If you have a "Universal" AC adapter it would be great...it would allow us to swap- test it.

Bits ...
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threepeAuthor Commented:
Unfortunately the only universal AC adaptors I have do not have the hex connection needed for this laptop.  It looks like changing the CMOS battery has actually solved the issue.  This was quite a ballache as everything in the laptop had to come out as the battery was on the wrong side of the system board :(

Anyway, thanks for your help, it does look like I am well on the way to solve this.  Just have to get the CPU fan working again, I don't think that connector liked my handiwork :(  May need a new fan, but that is peanuts compared to the cost of a mobo or anything else.
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threepeAuthor Commented:
Not quite the solution, but put me on the right track.  Thanks
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BitsBytesandMoreCommented:
It would be very "weird" that a bad CMOS battery would make the system "Turn-On". It would be more likely that you had some connection making a short or maybe a corrosion bridge... Who knows... I guess, hopefully we will never know.

Bits...
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