Hi there I have replaced the the 8400M GS in my 5720Z because it died. Now I have the 9600M GS with 512MB DDR2 and Windows works without any problems. BUT when the laptop starts the 30sec bios post shows up referring to the mxm bios data structure being wrong. Code: MXM structure not found or invalid Refresh MXM rom or add MXM structure ans associated callbacks to SBIOS! Post halted performance limited until resolved... But after 30 secounds it starts and works normally. I have copied the bios with GPU-Z My bios GF9600M GS 512MB DDR2 MD5: C5469B937E3B4DA4FD8D4E5FA50C3B11 I have searched the internet a bit and it looks like there are some modifications needed to the file. But I'm not an expert. I have found a similat problem to my on another forum: Acer Aspire 5520-7416 MXM II 8600GT? - LaptopVideo2Go Forums and a partial sollution here: http://forum.notebookreview.com/har...structure-not-found-invalid-post-message.html If anone of you could edit the BIOS file for me either to eliminate beeping or to eliminate the POST message. Thanks in advance.