It depends on the declared value of the item. If it is a used PC
it is likely that there is no export customs form needed, the form is for statistics only anyhow.
Shipping method is important as well.
It needs more details and much better phrasing of the question to expect an answer.
Last, get a quotation for which the weight and the doimensions are needed. Before shipping ask for the duty in Turkey , add duty and VAT in Turkey plus cost of customs clearance to the shipping costs and then you can decide if it makes sense in first place or better keep the PC