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Bios problem Acer Aspire 5715z not solved yet..

Hello,

I'm now looking for the cmos battery to reset the BIOS. But i'm not sure where to look. I opened the laptop on the front and the back.. see those pictures:

front: http://img25.imageshack.us/img25/2930/achterkantw.jpg
back: http://img17.imageshack.us/img17/9632/voorkantn.jpg

Can someone please tell me where i have to be?

Thanks in advance..

Note: Sorry for my bad english..

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