My Dell Precision 670 will not boot Windows 7 after upgrading the memory to 8GB. Configuration follows: *BIOS A06 *2 x 4GB SIMMS in slots 1 and 2. These are correct WS670/4GB PC3200 EEC registered modules as recommended. *memory fan is installed *3 SCSI drives with Adaptec 7901 RAID controller. I've got a dual boot setup, and the system boots and runs fine from the alternate OS (Win XP x64) just fine. The BIOS lists the memory as installed and shows no errors or problems. A memory test indicates that the memory is okay. When I try to do a boot repair from Win7, the Win7 OS is not listed and installing the correct RAID and SCSI drivers from the repair window does not make it visible. The partition is not, in fact, visible from the repair tool. When I put the old memory back in (4 x 512mb SIMMS in slots 1,2,3,4) the system boots and runs fine with Windows 7. What's up with this?? I flashed the system with the A07 BIOS this morning and will try again tonight to see if that made the difference. I will post the results here. I welcome any other suggestions.