banjovibes

Hi guys I have a problem here i dont know if anyone will be able to help, i mistakenly put the wrong power cable 19v instead of 12v on my seagate external disk, now the disk is not spinning or anything, there is no smell coming out or any rattling sound coming from the harddisk, i have tried everything possible, taking the disk out of the casing and connecting it as a slave inside a pc still nothing is happening, the data on the disk is very valuable and i desparately want it the specifications on the disk are as follows. 500gb seagate barracuda 7200.10 s/n 9qg3aymw st 3500630a p/n 9bj046-567 firmware 3.aaf date code 08053 site code tk i woul be very graetful if someone would help thanks in advance