No power I was wondering if I have to have a motherboard installed to get the fans going? If not. I have no power. Could I have hooked it up wrong? I had a bit of inswtruction problem with where the output .5 amp went after I conected all the fans together. Thanks

Hello
You may have the reboot or restart wires backwards.Or on the wrong pins on the motherboard.

Here is a link to your mobo. Shows correct hook up.

Also be sure your memory sticks are in proper slots.If you have 2 they need to be seperated.
One in one channel the other in the second channel slot.Usually the slots are color coded.

http://dlcdnet.asus.com/pub/ASUS/mb/sock478/p4p800-vm/e1338_p4p800-vm.pdf

Hello, You might have a bad motherboard and need to replace.
First, I know its a pain but disconnect and reconnect all cables verify that your not missing one of your power cables look for any connections on the board that don't have cables hooked up to it. take extra care when hooking up your power button cable. Its easy to accidentally place them in the wrong pin.
Hope This Helps

Sounds like you should take it to a qualified repair shop to have this sorted out. new thermostat is hooked in but does not work either. ??????? The thermostat does not open ???? Engine over heats ? You put it in backwards . Cooling fan relay turns on the cooling fan . It's tough to guide someone through a diagnostic procedure when then don't have any idea how the system works .

Maybe your power suplly can't work well with your mobo
try to replace the power suplly

sound like you need a power supply

The way that I solved the problem was to unhook each and every connection to the motherboard except for the 4-pin and 24-pin power supply connections, the processor, the cpu fan and the power on switch connectors, once I have done that, then I plugged in the power supply and turned it on, in which that worked! After that, I would hook everything up to the motherboard one piece at a time, in which after each piece I would turn the power supply on again to see if that was the problem. Starting with the hard drive, the memory sticks and then the DVD drive, and found out that was the problem. The cable between the DVD drive and motherboard was the wrong cable for that motherboard. I will purchase a new cable and see if that works!

cheak and change ur power supply

This may be a silly question, but have you plugged the 4 pin power cable to the motherboard as well as the long power plug.
You will see the 4 pin power slot fairly close to the heatsink.
Jumpers generally come already set.
Make sure you have seated everything correctly, take out the ram and when you put it back in hold your fingers under the mobo, there may not be enough support under the ram slots therefore the mobo will bow and sometimes the middle of the ram will not be touching the slots.
Hope this works.

power suplly problem

Did the CPU and cooling fan come pre-installed or did you have to install it? Did you forget the separate 4 pin power connector from the power supply to the motherboard? Is the speaker hooked up and are there any beeps? Do all the fans spin up? Do you have a video card that requires additional power connection and forgot to connect it?