It's likely your system is dead and will need to be sent in for repairs. There are reports of the hard drive becoming corrupt during failed firmware updates, but the behavior your describing does not sound like it. With the firmware issue, the system would often turn on, but after saying Sony Computer Entertainment, the cross media bar would never show up.
Sorry for your bad luck; hopefully Sony fixes it under warranty.
Message edited by Heyyou27 on 08-08-2008 at 05:39:50 PM