Question : active directory problems

A few days ago, our pdc went down with bad memory.  The pdc is the primary dns server and dhcp server for the network.  While we were waiting for the part.  I made one of the other DCs a dhcp server and primary dns server, just to get people working.  That seemed to work fine.  When we got the pdc back up, I disabled the DNS and DHCP roles on the other DC to try and get everything back to normal.  Well now we cant get the pdc to replicate with the other DCs.
the error is:

"target principal name is incorrect"

 We cant access shared resources by the PDCs name.  We get the error:

"login failure: target account name is incorrect"

But i can map drives and printers by IP address of the PDC. In event viewer, there are a bunch of Kerberos errors:

event id 5 ....something about time out of sync
event id 4 on the other DC, account name mismatch

Any help or guidance would be much appreciated. Thanks

Answer : active directory problems

Sounds like it needs a good old fashioned reboot. Definately try demoting and promoting it.

Let us know how it goes over the weekend! Best of luck.