Power supply Diode problem, difficulty identifying diode.

I got a Laptop Toshiba Satellite 1800 series. It was power with the wrong adapter with opposite polarity. The Diode at location D-800 seems to have blown off along with the fuse. Can anybody shed some light on what kind of diode it is, how to identify or how to fix the particular probem. The laptop obviously is not powering on after the incident.

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