Lets assume that the flash is ok for the moment.
I agree with Jock
I do not understand the deviations I see in your partition table.
The number blocks is not correct for sdb1 and sdb6. I have several NAS device here (also one with a seagate disk) and all give exact the partiton table as mentioned in the how to guides.
Especially the sdb6 size is suspected as from that partition the Linux kernel is loaded. further if U-boot cannot access sdb7 then boot also will be aborted and the blue led will be steady on.
So it seems in your case that it fails to find either the kernel or the root file system
First step is to get that partition table right
This is the table from the original nwsp2 disk with lacie software on it
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Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/sdb1 1 250 2008093+ 5 Extended
/dev/sdb2 251 121601 974751907+ 83 Linux
/dev/sdb5 1 32 256977 82 Linux swap
/dev/sdb6 33 33 8001 83 Linux
/dev/sdb7 34 34 8001 83 Linux
/dev/sdb8 35 140 851413+ 83 Linux
/dev/sdb9 141 249 875511 83 Linux
/dev/sdb10 250 250 8001 83 Linux
Notice that partitions of 1 cylinder in size have 8001 blocks
This should be changed to this to run our firmware (as described in the how to guide)
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Device Boot Start End Blocks Id System
/dev/sdb1 1 64 514048+ 83 Linux
/dev/sdb2 65 128 514080 83 Linux
/dev/sdb3 129 192 514080 82 Linux swap
/dev/sdb4 193 121601 9xxxx+ 5 Extended
/dev/sdb5 193 292 803218+ 83 Linux
/dev/sdb6 293 293 8001 83 Linux
/dev/sdb7 294 357 514048+ 83 Linux
/dev/sdb8 358 121601 9xxxx+ 83 Linux
The blocks for sdb1, sdb6 and sdb7 are different in your partition table.
May I suggest that you try to do that again
ps I have read somewhere that if a partiton sdb10 is present containing a kernel it will try to load that and then our firmware will not run. Did you delete all partitions and hit the "w" command after doing that. Seems yes as I do not see sdb10 in your table.
But as said the partition table is not as it should be as such our first line of attack