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i just installed a new nvidia 8600 and a 2gb ram module on my system and now my monitor doesn't show anything! please help 
display problem!
Please post some more info on your PC specs.
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well pre-upgrade it was an intel pentium D 2.8 on an intel mobo(not sure which one) with ati x200 onboard graphics, 512 mb of ram and an 80 gb sata drive and a 160 gb pata drive
1)Disable the onboard graphics from BIOS if you haven't already.
2)If that doesn't work check that your power supply has enough juice to feed the graphics card.
*www.guru3d.com/article/geforce-8600-gt-and-gts-review-and-shootout/5
3)If that doesn't work take out your PCI-E card reinstall windows and then without installing drivers for onboard gfx plug in the PCI-E card and install it.
4)If you want to skip above step then try to clean your system of installed drivers with some utility,all this assuming that your onboard gfx works.
Hope it helps.
2)If that doesn't work check that your power supply has enough juice to feed the graphics card.
*www.guru3d.com/article/geforce-8600-gt-and-gts-review-and-shootout/5
3)If that doesn't work take out your PCI-E card reinstall windows and then without installing drivers for onboard gfx plug in the PCI-E card and install it.
4)If you want to skip above step then try to clean your system of installed drivers with some utility,all this assuming that your onboard gfx works.
Hope it helps.