Summary: If a PC cannot find a network until rebooting, check the speed settings of the network card as well as the functionality of the card itself.
One of 8 systems will often not find the network until I reboot. What should I fix?
I would check that you have the latest network drivers, and that the network card is set to a fixed rather than auto-detect speed. I'd also check the cable, and if you have an extra network card lying around I'd be tempted to swap it out in case the card in this machine has a problem itself.
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Article C2054 - June 14, 2004