Alan Bartlett wrote: > Then surely it comes down to an issue with either *your* video > controller card or monitor. Please now try the obvious, follow > scientific procedures and swap them out, one at a time. Clearly, it is a > hardware problem and nothing to do with CentOS - unless you can convince > me otherwise. I will first have to find a new vga card to try that.. But I do know it isn't the monitor, as the three other boxes connected to it never show this sort of behaviour.. I have found a way to provoke the flashes, by the way; simply invoking ifup and ifdown triggers it. -- Chers, Morten