Blank screen after reinstalling memory

[Guest]

I am having a problem with my computer it was working great before I did a good cleaning on it, every thing is installed back the way it was but when I installed the memory and started the computer up I get a blank screen the green light on the monitor is just flashing not coming on steady. Nothing has changed other than lack of dust. I have resetted the ram 3 or 4 times and checked all my conections. Any ideas as to what may be causing this problem. everyting worked great before the cleaning.

 

[Crashman]

You might have bumped your video card a little loose in the slot.

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[lunitic]

You might have killed your ram, possibly static electricity. But also your PSU might be not connected. what's happening and what's not?

 

[twofruitz]

my computer did this, after days of scratching my head i found out the my graphics card was out by about 1 mm. push it in hard and try it again,

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Intel PIV 2.4C @ 3.0G \
Asus P4C800 \
Corsair 2x512 3200LL memory \
Radeon 9600pro @ 500/700/1.35 \
SB Live 5.1 \
80G Seagate S-ATA150 \
430 Antec 1080AMG