No internal fuses, sorry. If the power surge cam in on the AC power line then the external power adapter in most likely dead. You can check the output power with a multitester set to DC voltage, it should be 32volts. If it is bad then you need to replace it, they are available on Ebay here:
http://www.ebay.com/sch/i.html?_odkw=officejet+8600&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313&_nkw=officejet+8600+adapter&_sacat=0If the power surge came in on the phone line and you had it connected to use it as a fax then the main logic board will need to be replaced. You would need to get the HP number on the side of your logic board to order one of these, there are several versions and you need your number to get the correct one.
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