I have a Dell PowerEdge SC420 that I have converted for use as a desktop. The motherboard is Dell part # RG156 listed on my invoice as a Planar motherboard. my GEForce 6200 video card driver fails periodically under Vista Home Premium. The system works great otherwise, I just wonder if there is some motherboard characteristic involved here.
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An Amber blinking power button indicates a low voltage problem. This can be caused by a defective power supply or a defective motherboard.May also be caused by a defective card installed in the motherboard, i.e. video card.
If it is a steady once-per-second beep - or a constant screech - and it is able to boot to the OS (or even most the way), then it is probably your RAID controller. Boot to CTRL-A or CTRL-M to check the status of your array.
There are a huge range of motherboards to choose from. The mounting holes on the motherboard will match the desktop mounting plate, these are standard configurations. Stick with the well known brands and with the functions that suit your requirements. My choice of brands are Gigabyte, Intel, MSI. Most of the late model motherboards have SATA disk controllers. If you are into gaming and video editing etc. go for a motherboard without a built-in graphics card and purchase a separate high end graphics card.
Are you sure the new motherboard was of the same revision as the old one? Dell shipped 400FSB boards during the beginning of the 1600SC line and shipped 533Mhz boards during the end of the run. I would check the revision level of the motherboard to make sure it is compatible. If it's the same revision, I would start small and connect just one CPU and put the system at 512mb ram and see if that works. If this works, you can begin to add additional components as needed.
The fans that are plugged into the motherboard are usually powered by the motherboard. To turn them off, simply unplug them as there is always a power flow going through the motherboard and even more to power the fans when the system is running. I would recommend keeping the fan in if possible to help with cooling your PowerEdge 1400 server, but if it must be removed, simply power your server down, and unplug the fan. Make sure your server is powered off before doing this, as you don't want to short anything out or cause a spark.