BRICKED ?????

Hi guys

I have a SGP521 (dutch)

I had it rooted, dual recovery installed and flashed prerooted rom.
Now there was an update. A prerooted rom (this one: http://forum.xda-developers.com/xper...t3212176/page2

HELP !!!!!
i wanted to update my tablet and wanted to update it with this prerooted rom.
So i went into (dual) recovery....philz.
i cleared cache,dalvik and (user)data.
wanted to flash the zip from this thread.....but downloaded it onto internal sdcard......but that was gone due to the data format. I downloaded it again on external sd card.

Now it comes:
i wanted to reboot the device again into recovery........but it didnt react at all after the format...so i used a hard reset (pin on red square next to sim)
Now when i power it on...it only gets to SONY logo.........there is no vibration to get into recovery !!! It doesnt boot at all. The device doesnt even show the charge logo when connected to usb/charger...and the PC doesnt recognize the device (off course...because it doenst boot at all!!!).


What have i done and what can i do about it ????