Nvidia nforce2 mpc - no graphics on boot up... please help?!

I'm not very good with computers so forgive me but I'm having a problem.
I just got given a nvidia nforce2 mpc K7N2G
I already have a 2400+ xp processor
512 DDR ram (brand samsung)
I think I've installed everything correctly but on boot up I can't seem to get any output on the monitor. I've tried putting in a separate graphics card (gforce4 i think) but still nothing. I've tried a different monitor and still nothing.
I've reset the CMOS, changed the battery, I don't know if there are any jumpers on the motherboard that disable the on board graphics as the manual doesn't specify anything. I've ran out of things to try!
Any help would greatly be appriciated!
Joanne

Quote from: MGP on 18-February-06, 04:56:38
What does it do when you boot up?
Any beeps? - case speaker must be connected to hear any system beeps.
What size P/S are you using?
CPU properly seated?
CPU heatsink installed corectly?
CPU fan connected to the proper header?
What is all connected right now, is it in a case?
no beeps... although the speaker could be in the wrong place
P/S? power supply? in which case its 500W
everything is in place correctly and the fan is connected properly...
It's in the case at the moment.

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Originally posted by syar2003
If running a LCD display with DVI connection , try to hook it up with
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