Replaced RAM: mobo won't POST - any ideas?

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My main PC is an ASUS P5E64 WS Professional.  After ensuring the mobo supports DDR3 1333 I went ahead and bought 4 x 2GB Transcend DDR3-1333 DIMMs today.  I poped them in and the mobo fails to post - no beep, no signal to video etc..  A blue LED labelled DIAG DRAM lights up on the mobo. I checked to ensure they're all seated properly etc and retried.  No cigar (or smoke  ;)).  Put the 2 x 1GB DDR3 1066 sticks back in and it posts.  I noticed tonight that Transcend isn't on the Qualified Vendor List for this mobo, but damnit, dram is dram, not so?  What do you guys think - is the likely a compatibility issue or could the DIMMs be faulty?
 
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