Hi, I'm having a problem with my PC freezing every so often and I'm wondering whether I have a problem with my ATI Radeon X800 Pro running under XP. Should the cooling fan turn constantly? At power up the fan on the x800 runs for approx. 5 secs then stops. Does the card have a temp sensor and therefore only operates the fan when required? AMD/ATI Support centre doesn't seem to have the info I'm looking for. Thanks in anticipation.