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no it's not a fly, sorry to not get back before. It looks like an black ink mark, not really sure i would be up to opening out the casing to sort it out.
I do pay a monthly fee for so called expert technical help, however i have been reluctant to call them, as the last time i did this, i ended up with no computer for a year. Long story. Plus i have heard some horror stories of computers being lost, or wiped clean..
Would it be advisable to at least call them, and ask what can be done..