My guess is no one has ever heard of a DS1215+. If you mean a DS1512+ there's tremendous discussion and several threads on this forum about the bad batch of these (and the DS1812+) that experience exactly what you are, the Blue Blinking LED of Death. It's not surprising if you took a bad one back to the place you bought it, you'd get another bad one. Everything you need to know about this has been posted multiple times recently.
DS 1512+ w/3GB, 5 x 3TB Seagate ST3000DM001 8.2TB RAID 6, half files/half Time Machine.
Icy Dock MB559U3S-1SB enclosure w/4TB Hitachi UltraStar via USB 3 for files backup
UVERSE to AirPort Extreme + 2 AirPort Express w/speakers. TRENDnet TV-IP312WN camera
CyberPower CP1500PFCLCD Sine Wave UPS
DSM 4.1-2661 w/SSH + SFTP, VPN Server, Syslog Server, Media Server, Mail Server, Mail Station,
Audio Station, Surveillance Station, Photo Station, Web Station - DS Apps on iPad & iPod Touch.