Yep, I'm with Mark on this, take all the memory out and you ought to get a beep code, or at least a screen message.
Likewise leaving the CMOS battery out should give you a screen prompt for date/time. I'm pretty sure no keyboard will usually also give you a beep code.disconnect keyboard to get a beep code.
I'm presuming you've disconnected all external peripherals, esp any USB devices?
Does the monitor ever go Live (on mine the on-off switch changes colour when it gets a signal).
If so you may have a BIOS splash screen obscuring a useful message that early in the start up process (though it sounds like it may be too early even for that). In the BIOS turn of any splash screen.
Must say, I'm also with Z, as in if it is the mobo it is probably past it's sell-by - you can pick up refurb machines reasonably cheaply these days (in the UK anyway!!).
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