Inspiron 17, specific power problem (bug ?)

Hello everyone,

i recently got a new Dell Inspiron 17 (3737) and i encountered a very strange behaviour.

The short version is, that sometimes i can't turn the notebook on until i unplug it.

I tested some situations and i think that i narrowed it down enough by now.

Now i can reproduce it.

The AC charger has to be plugged in, the battery has to be in the laptop and the battery has to be below 100% (95% to be sure) of charge.

In that case the battery is charging. If i turn the laptop off, it is still charging. Indicated by the small white led on the front.

Now, in that moment, when the battery hits 100% charge, the white led turns off and i can't turn the laptop back on.

Absolutely nothing happens if i press the power button or anything else.

Until i unplug the AC. After that everything works fine.

But that is just a workaround. The laptop sits on the desk 99% of the time. AC is always plugged in.

But for some reason, i guess battery health, the battery discharges to 96% sometimes and starts charging again.

 At first i had BIOS A06, that was the worst. The problem occured almost evey single time i used the laptop.

Sometimes even when i took the battery out !

I downgraded to A05 and it was way better. But still not ok.

Now i'm on A07 and it's the best of these 3, but i still can reproduce the problem.

But this time, i think, with the battery removed, it's ok.

Prior to A07, the Problem occured even under Windows.

Now it seems like it's only a problem if i shut it down with a battery below 100% (so it continues charging after shutdown)

I even took the harddrive out and tried a linux live cd. And even without any OS at all, just going into the bios until the battery is down to 95%, shutting it off, wait till it's charged up, and there we go, it won't turn on.

So it's not a problem of the OS. (I'm using Win 7)

I even tried another AC charger, the 65W cahrger from my other dell (vostro) fits and works.

Maybe it has something to to with this dell battery managment tools i jused once. There where these options for dektop battery mode and longevity mode, i activated them once, but deaktivated them soon after, and now i even uninstalled them. but maybe they  Substitute character removed as per TOU> something up in a nonvolatile memory somewhere, that i can't clear.