I just got the motherboard today and I tried to hook it up but I am not even getting it to come on. using atx 450w p4 power supply
I installed a M870 v2.0 into my cooler master atx case replacing my old M868G but get no response when switched on, the fans run and wireless pci card lights up but no bleeps or boot on cd rom or floppy?
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Your motherboard uses a standard ATX power supply 20 pin power connector. Most ATX power supplies should be compatible with your board..get a supply rated at 450 watts or higher for future expansion of your system
You can go as high as you want. Typically the higher the wattage, the more devices you can add as motherboard inputs are standardized so it won't make a bit of difference to the motherboard just so long as you stick with ATX power supplies. So you could go to 650w or even more and it won't make a difference, although you won't need that much wattage unless you have lots of drives and a power hunger discrete graphics card.
I tried different power supply but its still not powering up. But when i remove the 4 pin 12V cable from power supply the cpu fan is rolling, it means that the power supply is working but when i tried to connect the 4 pin then the cpu fan stop just a second and never rolled on. The main problem is the 4 pin, the model is Asus P5P800-VM. I tried to reset the cmos and replaced the battery but it wont work out. Please help me!!!
Either the power button itself is bad, or the mainboard is bad. You can test the power supply and mainboard by using a paperclip to short the green wire on the middle of the power connector that goes to the motherboard to the black wire next to it on the same connector. This will force the power supply on. If the mainboard still won't do anything, then it's dead, Jim.