My 3 year old SSD died on me few weeks ago and since has been replaced.
Instead of showing up in BIOS as "OCZ Agility" it now says "YOKOMONO ROM". Is it possible to flash this brick back to life????
It can usually be recovered with a destructive flash with the "jumper" on.
Follow this post for details.http://www.ocztechnologyforum.com/forum/showthread.php?104602-Vertex-30GB-shows-up-as-yatapong-barefoot-without-jumper-doesnt-detech-in-FW-aplications&p=753685&viewfull=1#post753685
Also check on post #8 in that same thread for the Agility.
If you can't recover the SSD this way, you will need to return it to OCZ.