Abit NF7 dimm3 doesn't work?

[ku]

I realized that I had my ram in dimm1, so I put it in dimm 3 (as said in the manual) but it won't boot. I keep getting bsod while it's loading. I tried blowing on it but it didn't help. Right now, it's in dimm2. I plan on ordering a second stick and I was wondering what the problem may be... any help?

EDIT: It works when I run it at 200mhz. can anyone help? T_T
EDIT: Also works when I run it at 333mhz, but not 400mhz. Tried all the voltages and stuff and no change...

 

[StrangerGuy]

Firstly, its the RAM rated for PC3200?

You can reinstall the RAM in DIMM3 and try again.

 

[ku]

It's rated for 433mhz (PC3500... as said in my signature).

I've tried blowing on the slot, and when that didn't work, I tried cleaning it with a piece of soft cloth. Nothing helped... T_T