NetBoot : some Macs not reacting

Hi there!
We are currently running the latest OS-X Server (10.4.10) on our XServe dual-G5 and offfer a Netboot service to 4 Mac clients (a preliminary test phase). One machine served as our image disk, which I drew a system image from using the target disk mode on our G5Quad. All went well and the image is bootable as intended.
However, when deploying our client machines, I noted that 2 of the 4 machines are not booting from the Netboot image but show the blinking question mark on the startup screen (the disks are empty on all clients). The other 2 machines however boot in no time with the same image.
If I start the non-booting clients by keeping the "N" pressed, they boot perfectly as well...
Now, I've checked all the standard issues like DHCP, conflicting IPs, net availability, etc. and nothing so far has crossed my attention. All receive a correct IP address (related to their MAC addresses) and all can "see" the network properly. Here's a short log excerpt from netboot :
Client # 1 and # 2 booting correctly:
Oct 8 11:26:18 ComEtt-2 bootpd[1145]: BSDP DISCOVER [en1] 1,0:17:f2:cf:d:73 NetBoot004 arch=i386 sysid=iMac5,1
Oct 8 11:26:20 ComEtt-2 bootpd[1145]: BSDP INFORM [en1] 1,0:17:f2:cf:d:73 NetBoot004 arch=i386 sysid=iMac5,1
Oct 8 11:26:20 ComEtt-2 bootpd[1145]: NetBoot: [1,0:17:f2:cf:d:73] BSDP ACK[LIST] sent 10.64.91.2 pktsize 300
Oct 8 11:26:21 ComEtt-2 bootpd[1145]: BSDP INFORM [en1] 1,0:17:f2:cf:d:73 NetBoot004 arch=i386 sysid=iMac5,1
Oct 8 11:26:21 ComEtt-2 bootpd[1145]: NetBoot: [1,0:17:f2:cf:d:73] BSDP ACK[LIST] sent 10.64.91.2 pktsize 300
Oct 8 11:26:22 ComEtt-2 bootpd[1145]: BSDP DISCOVER [en1] 1,0:17:f2:ca:b4:db NetBoot001 arch=i386 sysid=iMac5,1
Oct 8 11:26:22 ComEtt-2 bootpd[1145]: BSDP OFFER sent [1,0:17:f2:ca:b4:db] pktsize 454
Oct 8 11:26:23 ComEtt-2 bootpd[1145]: BSDP INFORM [en1] 1,0:17:f2:cf:d:73 NetBoot004 arch=i386 sysid=iMac5,1
Oct 8 11:26:23 ComEtt-2 bootpd[1145]: NetBoot: [1,0:17:f2:cf:d:73] BSDP ACK[LIST] sent 10.64.91.2 pktsize 300
Oct 8 11:26:27 ComEtt-2 bootpd[1145]: BSDP INFORM [en1] 1,0:17:f2:cf:d:73 NetBoot004 arch=i386 sysid=iMac5,1
Oct 8 11:26:27 ComEtt-2 bootpd[1145]: NetBoot: [1,0:17:f2:cf:d:73] BSDP ACK[SELECT] sent 10.64.91.2 pktsize 457
...only when I press "N" come the missing 2 :
Oct 8 11:27:09 ComEtt-2 bootpd[1145]: BSDP DISCOVER [en1] 1,0:17:f2:c6:8f:3 NetBoot005 arch=i386 sysid=iMac5,1
Oct 8 11:27:11 ComEtt-2 bootpd[1145]: BSDP INFORM [en1] 1,0:17:f2:c6:8f:3 NetBoot005 arch=i386 sysid=iMac5,1
Oct 8 11:27:11 ComEtt-2 bootpd[1145]: NetBoot: [1,0:17:f2:c6:8f:3] BSDP ACK[LIST] sent 10.64.91.4 pktsize 300
Oct 8 11:27:12 ComEtt-2 bootpd[1145]: BSDP INFORM [en1] 1,0:17:f2:c6:8f:3 NetBoot005 arch=i386 sysid=iMac5,1
Oct 8 11:27:12 ComEtt-2 bootpd[1145]: NetBoot: [1,0:17:f2:c6:8f:3] BSDP ACK[LIST] sent 10.64.91.4 pktsize 300
Oct 8 11:27:14 ComEtt-2 bootpd[1145]: BSDP INFORM [en1] 1,0:17:f2:c6:8f:3 NetBoot005 arch=i386 sysid=iMac5,1
Oct 8 11:27:14 ComEtt-2 bootpd[1145]: NetBoot: [1,0:17:f2:c6:8f:3] BSDP ACK[LIST] sent 10.64.91.4 pktsize 300
Oct 8 11:27:18 ComEtt-2 bootpd[1145]: BSDP INFORM [en1] 1,0:17:f2:c6:8f:3 NetBoot005 arch=i386 sysid=iMac5,1
Oct 8 11:27:18 ComEtt-2 bootpd[1145]: NetBoot: [1,0:17:f2:c6:8f:3] BSDP ACK[SELECT] sent 10.64.91.4 pktsize 457
Oct 8 11:27:32 ComEtt-2 bootpd[1145]: BSDP DISCOVER [en1] 1,0:17:f2:cf:d:2d NetBoot003 arch=i386 sysid=iMac5,1
Oct 8 11:27:34 ComEtt-2 bootpd[1145]: BSDP INFORM [en1] 1,0:17:f2:cf:d:2d NetBoot003 arch=i386 sysid=iMac5,1
Oct 8 11:27:34 ComEtt-2 bootpd[1145]: NetBoot: [1,0:17:f2:cf:d:2d] BSDP ACK[LIST] sent 10.64.91.3 pktsize 300
Oct 8 11:27:35 ComEtt-2 bootpd[1145]: BSDP INFORM [en1] 1,0:17:f2:cf:d:2d NetBoot003 arch=i386 sysid=iMac5,1
Oct 8 11:27:35 ComEtt-2 bootpd[1145]: NetBoot: [1,0:17:f2:cf:d:2d] BSDP ACK[LIST] sent 10.64.91.3 pktsize 300
Oct 8 11:27:37 ComEtt-2 bootpd[1145]: BSDP INFORM [en1] 1,0:17:f2:cf:d:2d NetBoot003 arch=i386 sysid=iMac5,1
Oct 8 11:27:37 ComEtt-2 bootpd[1145]: NetBoot: [1,0:17:f2:cf:d:2d] BSDP ACK[LIST] sent 10.64.91.3 pktsize 300
Oct 8 11:27:41 ComEtt-2 bootpd[1145]: BSDP INFORM [en1] 1,0:17:f2:cf:d:2d NetBoot003 arch=i386 sysid=iMac5,1
Oct 8 11:27:41 ComEtt-2 bootpd[1145]: NetBoot: [1,0:17:f2:cf:d:2d] BSDP ACK[SELECT] sent 10.64.91.3 pktsize 457
Our DHCP server is a Linux machine BTW...no issues here as well.
Maybe anyone has any insights on this...help would me greatly appreciated!
TIA!

Hi and thanks for your reply.
However, like I stated in my previous post, the problem is not the startup disk chosen...if so, why would 2 of 4 Macs start correctly from the net an the remaining only by being forced to netboot with the "N" key? All Macs were prepared in the exact same way.
What I came up with was the latest EFI update for iMacs. I am going to try to find out which Mac was updated and which not. Maybe that's an explanation why some Macs seem lost!
Cheers!

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