Error when importing from Excel in SAP

Hello experts,

My gets error when importing price list using the import form Xl menu :

(-1200) DBMCconnBase::EndTransaction SQLEndTran sqlState 08S01, nativeErr: 0, errText:[Microsoft][SQL Native Client] Communication link failure

This happens only when connected with SAP Client, it never happens when connected in terminal server directly on SAP server.

Server 2003, MSSQL 2005 SP2

SAP 2007 Sp01 PL08 HF01

This has always been working before, it has stopped working when he changed the motherboard 3 weeks ago. Nothing else have changed.

Any idea where to look at?

Thanks!

Chris