I have one machine that does something similar, (if not the same).
It never did it until I switched to a FREE LCD monitor I got at
an event as a door prize. Based on past experience, I believe it
is a factory defect that caused it to be "given away" (in the channel)
rather than be actually fixed...)

Note: I always get the POST "beep"... If you do not, this will not help.
When I cold boot, the POST screens will not display (at all, sometimes)
until it gets to the BIOS password screen. (Then all is well...)
(It "seems" like a BIOS video mode switching problem.)
I know it is booting to that point normally since I run a "POST Card"
decoder (PCI card to "track" the operations during POST.)

All I have to do is turn the (LCD) monitor off and back on during
this "failure" and it resets the video and displays everything.

Hope this "workaround" works for you.

Note: When I have the BIOS "long POST diagnostic screens" turned
on, it really "can" seem like the computer is frozen while it checks the
RAM numerous times... (Which I can't see...)

                                          Rick Glazier

From: "Johnny"
>I Currently got a new computer and lately the monitor  won't "run" when i=
> turn the computer on. 

>On a regular occasion the monitor shows a screen that would seem to be un=
>plugged. even though it is plugged in. after turning the computer off at =
>the wall and letting it rest and then trying again sometimes it repearts =
>itself and othertimes it works.

>I have figuered out it is not the monitor has i  have tried it with my ol=
>d system.

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