I have put together a new computer: mother board, cd rom, hard drive, AGP video card, DDR memory stick. Power up the unit, fans come on, lights on mother board, no post beep, nothing on monitor..? I've removed everything and tried starting... nothing still. Any thoughts?

The only thing I would have to say is make sure the main components on the board are completely pressed in properly, especially the processor... some processors (the cartridge type) look like they are in correctly, but aren't