Did you do a flash update on the BIOS that may have failed?  You also need to check to see if the video card and the CPU are properly seated, although if the EEPROM is not fried, it should beep on POST.  Are you getting a message on your monitor screen that says your monitor is working and you should check your connection?  Is it possible this machine took a lightning strike or power surge?  Possibly your new power supply put out too much current when it got fired up and fried the EEPROM.  If there are absolutely no beeps and no POST, your mobo may be history.  You might want to contact the manufacturer if it is still under warranty.
>Machine - AMD 800, Win 98
>
>        That machine won't post - the fans (PS and CPU) come on, but nobody's
>home (no beeps).
>        The Keyboard flashes, the power-on lights around the switch lights up,
>but no post.
>        History - the Powersupply was replaced (warranty) about 2 months ago, and
>has operated alright since then.  It is a second machine, and I only turn
>it on maybe once a week +/-.
>        The archives (FreePCHelp) had an article where the suggestion was
>given (I forget the name) to open the machine and make sure all connectors
>are connected properly.  I did that, as well as remove and re-install the
>RAM.  If you need further information on the machine, please ask.
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