PXE Stuck at "Contacting Server"

Hello !

I have a problem on my PXE. It works with all computer but one. My PXE is activate for unknown computers.

I just have a problem with one fresh from the box, and when I press F12 it gets an IP, downloaded WDSNBP then it's stuck at this point :

"Pending requests ID: 12

Message from Administrator :
Please wait. SMS is looking for Policy

Contacting Server : 192.x.x.x"

I had a look to the SMSPxe.log and I found it keeps looking for the Boot Image :

"Client lookup reply: <ClientIDReply><Identification Unknown="0" ItemKey="0" ServerName="" ServerRemoteName=""><Machine><ClientID/><NetbiosName/></Machine></Identification></ClientIDReply>
    SMSPXE    19.11.2013 16:40:48    5048 (0x13B8)
9C:B6:54:A2:0F:29, CE70CA32-5008-11E4-B0A9-C3EAC0070088: device is not in the database.    SMSPXE    19.11.2013 16:40:48    5048 (0x13B8)
Looking for bootImage GVA00004    SMSPXE    19.11.2013 16:40:48    5048 (0x13B8)
Looking for bootImage GVA00004    SMSPXE    19.11.2013 16:41:08    5048 (0x13B8)
Looking for bootImage GVA00004    SMSPXE    19.11.2013 16:41:27    5048 (0x13B8)
Looking for bootImage GVA00004    SMSPXE    19.11.2013 16:41:47    5048 (0x13B8)
Looking for bootImage GVA00004    SMSPXE    19.11.2013 16:42:07    5048 (0x13B8)
Looking for bootImage GVA00004    SMSPXE    19.11.2013 16:42:27    5048 (0x13B8)
Looking for bootImage GVA00004    SMSPXE    19.11.2013 16:42:47    5048 (0x13B8)
Client lookup reply: <ClientIDReply><Identification Unknown="0" ItemKey="0" ServerName="" ServerRemoteName=""><Machine><ClientID/><NetbiosName/></Machine></Identification></ClientIDReply>
    SMSPXE    19.11.2013 16:43:06    5048 (0x13B8)
9C:B6:54:A2:0F:29, CE70CA32-5008-11E4-B0A9-C3EAC0070088: device is not in the database.    SMSPXE    19.11.2013 16:43:06    5048 (0x13B8)
Looking for bootImage GVA00004    SMSPXE    19.11.2013 16:43:06    5048 (0x13B8)
Looking for bootImage GVA00004    SMSPXE    19.11.2013 16:43:26    5048 (0x13B8)
Looking for bootImage GVA00004    SMSPXE    19.11.2013 16:43:46    5048 (0x13B8)
Looking for bootImage GVA00004    SMSPXE    19.11.2013 16:44:06    5048 (0x13B8)
Looking for bootImage GVA00004    SMSPXE    19.11.2013 16:44:25    5048 (0x13B8)
Looking for bootImage GVA00004    SMSPXE    19.11.2013 16:44:45    5048 (0x13B8)
Looking for bootImage GVA00004    SMSPXE    19.11.2013 16:45:05    5048 (0x13B8)"

GVA00004 is my x86 boot image, which is the right one.

I thought it would be the drivers, but I installed the same model from the same serie like 30 minutes before this one...

Would be nice if someone as an idea....

Rafael