The Chispset fan on my Visiontek Geforce 3 has quit. The system started locking up during games and after I ruled out processor heat and memory problems I noticed the fan is not running on the GF3. I have romoved it and it will not turn even with direct power to it. (from a mobo fan header) The heatsink seems to be glued on so how can I replace or repair the fan. I hate to Junk a $300 video card for what appears to be a 2 dollar fan. Thanks.