I'm doing a little research for a problem we confronted on Monday.
I'm trying to figure out what caused it.

This server was upgraded fromt 6.5 to 7.0 on October '01 and worked
fine since then.

Last Monday, the Sql service stop responding and we were unable to stop/restart the service.
The server was shutdown and restarted, but the problem continued.
Sql service starts for a second and stopped almost inmediately asking for the location of master.dat

If the server was upgraded to 7.0 almost a year ago, and have being restarted in numerous time without a problem, why it was looking for the 6.5 master.dat?

Bottom line, we reinstalled 7.0 an reattached the dabase, but what's wondering me if the master.dat message.

Any ideas?