New pc case and mobo p5b-vm do green light on board

I couldn't tell. Do you have a graphics card installed on the motherboard? What else do you have connected to the motherboard?

Disconnect everything from the board. Nothing plugged in the back except mouse and keyboard. Disconnect all hard drives and CD drives. If you have a graphics card installed, completely remove it from the board. You should have nothing connected except the CPU, and ram. Make sure of your connections and make sure the ram is installed and completely seated.

When you put it together, did you use thermal paste under the CPU cooler? Also disconnect all the front panel connections except the power button. If it starts, go straight into bios and give us the information I asked for above and set the bios to defaults as above. Let us also know the motherboard temp and the CPU temp. If you did not use thermal paste, don't try to start it. Get some thermal paste first. I will give you instructions on how to apply it. Make sure there are no extra standoffs and all standoffs are lined up with the mounting holes in the motherboard and all are screwed in. Try to move some of those cables out of the way and take some pictures so we can see what is going on.

If you have any questions, just ask.

OK, thanks.

You can download drivers and the manual here https://www.asus.com/Motherboards/P5...Desk_Download/

If I understand correctly, you have an e7500 CPU. I cannot find that CPU listed in the Asus CPU Support list https://www.asus.com/us/Motherboards.../HelpDesk_CPU/

Did you look at the list and find the e7500? I couldn't find it, but the e6700 is there. It won't take much time to replace the CPU to see if that is what the problem is. I would give it a try.

This should be a picture of your Motherboard. Make sure of the connections marked. Make sure they are fully seated. Please put 1 stick of ram in the top yellow slot. Only put 1 stick in. Unplug/turn off the power supply. Press the power button until the led lights go off or for 30 seconds to drain all power from the board. Remove the battery marked with a green circle. Take not of how it was installed. I may even go so far as to buy a new one. It is usually a model CR2032 and can easily be found at any computer store or watchmakers shop. They are really cheap. If you buy a new one, take the old one out before you leave to go get it. Remove the battery and leave it out for at least 20 minutes. Then replace it and turn on the power again.

With nothing connected other than the connections shown, 1 stick of ram and the CPU, keyboard and mouse. Try to start the computer. If you go into bios, please set optimized defaults, set the correct date and time, find all the info I asked about before, save and exit.

The second image is of the CLR RTC connection. Make sure this is in the normal position before starting any of this.

If you have any questions, please ask.

If it does boot into bios, when you save and exit, it will try to restart. You'll have to hold the power button down for a few seconds to get it to shut off.