Hi, After replacing my MB, see previous thread: https://www.techspot.com/community/topics/after-windows-7-update-no-boot-cant-access-bios.204865/ I ran into new problems (please note, the computer with the Asus board was working fine until the Windows update): I have replaced the Asus P7H55-M/usb3 MB with the Gigabyte Ga-P55-UD6, which was pulled from a working system. Specs are now: Gigabyte GA-P55-UD6 Core i3 1156 530 6GB DDR Memory (3x Kingston KVR1333D3N9/2GB) Crucial SSD M500 240GB Windows 7 Ultimate 64bit Geforce EN210 Tagan TG480 (480Watt) The first problem I ran into was that the pc was not able to boot and load entirely from a Windows DVD or USB stick (made bootable). After many hours of trying to find the cause I pulled out 2 of the 3 memory sticks (left only 1 in slot DDR3_1), and suddenly the pc was able to boot from the usb. To check if a dim slot was faulty I placed a 2nd stick into slot DDR3_4. Same problem. Then I switched both sticks between the slots, problem also wasn't fixed. After that I pulled one stick from slot DDR3_4, and the pc was working again. The sticks are fine, the slot must be faulty or dualchannel is not working properly. Anyway, I thought I was going to sort out the dualchannel problem later, so I kept one 2GB Ram stick. Already during the installationprocess, if I remember correctly, and also even before all drivers were installed I got spontaneous reboots. After disabling the automatic restart there is no BSOD. But in Safe Mode everything seems fine. So could it be a driver issue? But that is weird, because it even happened before all the drivers were installed. Or is it the PSU? The CPU is not getting warm (30C). I'm getting sick and tired of all these problems. Hopefully somebody is able to help. Let me know if you guys need more information. ---- Edit: Could it be that the power consumption of this board is much bigger than with the previous board? Some of the features: "Industry's First 24 Phase Power VRM Design GIGABYTE's cutting edge 24 phase power VRM design utilizes the highest caliber components to provide unadulterated, smooth power delivery for the CPU. Like a high performance sports car engine, GIGABYTE's 24 phase power design enables the best delivery of power to supercharge your system, giving extreme users unparalleled overclocking ability and the lowest temperatures to reach maximum performance levels. The innovative 24 phase power VRM has been designed and engineered to deliver fast transient response times through quick and seamless power delivery during extensive CPU loading variations. In addition, heat from the VRM is effectively reduced by spreading the load between the 24 power phases, resulting in a cooler and more stable platform."