ASUS P4P800 Deluxe/Pentium 4 3.0 Ghz Problem

I just purchased a ASUS P4P800 Deluxe Motherboard as well as a Pentium
4 3.0 GHZ CPU to upgrade a system I have. The system is in a Antec
Case with a 500W Power Supply.
What I have in this system is 1 Gig of PC3200 Memory (400 mhz) (one is
from my previous system, one new)
As well I have a ATI 8500 DV Video Card, a Santa Cruz Sound Card, and
a 4 Port USB Card as well as a SCSI Card and a Thermaltake CPU Fan.

When booting the PC it gets to the screen where it says the name of
the motherboard and to hit delete to go into the setup. It gives the
beep that shoudl say everything is okay with the system but it just
freezes there and goes no farther. I don't seem to get any of the
verbal prompts. I have tried disconnecting both of the hard drives,
the CD-ROM, DVD Writer, removed each card except the video card and it
still won't boot. I even tried removing part of the memory at a time
as well as checking all connectors and jumpers with no luck. Would
something as simple as the placement of the cables that are for the
reset switch/power switch, etc. affect it? Everything appears
connected correctly but twice when hitting the reset switch the next
time it did boot up but at this time no HD's were connected so it gave
errors saying the HD wasn't found but as well I was able to go into
setup but it did give an overclocking error for the CPU although I
don't know how I would have been overclocking it.

Any idea what could be going on? Could it be a bad motherboard or
CPU? I hate to return either or both and find out it wasn't that and
have thought of taking it by a local computer store to have them look
at it.

I appreciate the help. I ended up changing the jumper to clear the
RTC clock. Someone suggested this in email and sure enough now it
goes beyoung that screen. The only problem is I get around 2-3 series
of short and long beeps (3-4 in each series) and I have no clue what's
causing it. I also had to reinstall Win XP but I assume maybe this is
because I was using a AMD chip before in this system. As well, most
of the drivers, etc. for the motherboard seem to be installed. The
only thing I have probelms with is my USB ports but i am sure with
time I'll solve that. Everything (video, memory, CPU, appear to be
working fine. Any idea what all these beeps could be for though?

Unfortunately the combination of beeps is not explained in the
motherboard manual. As odd as it sounds I think I may have trouble
konwing which beep is the long and short beep but here is what I'm
getting:
Long Beep, pause, long beep, pause, short beep, 3 long beeps, pause,
long beep, pause, long beep, short beep, 4 long beeps. I could have
the long and short reversed but these all occur during the initial
bootup when I'm at the screen saying P4P400 and have the option of
going into CMOS settings.
I have all 2 512 meg DDR's in the first two slots, A1, A2, and they
were working fine at bootup and while using the computer but yet I
thought it may be what is causing these beeps. One of those slots is
black, one blue, and someone mentioned to use the like colors (both
blue or both black) so I changed it so now they are in the A1 and B1
slots. I still get these beeps but it does seem they have changed
slightly. Maybe it's more than one error and it's a video card or
some other problem. The thing is I have used the computer quite a bit
now and it's running so well and I have the USB 2.0 problem solved but
yet these beeps have to mean something and I hate to just ignore them.