Hi there and welcome to Just Answer. Thanks for asking your question.
Are you in the UK or USA?
Please understand that although you have made a deposit to Just Answer, I do not get paid until you click the ACCEPT button. Please do so if the following is helpful. If, after reading my answer you have a follow up comment or question, I am still obliged and willing to continue even if you have clicked ACCEPT.
So....If the unit is absolutely dead, I would take a look at the power board and see if the in line power fuse has blown. You will have to remove the cover of the DVD player to check this since it is not usually a user replaceable component. The power board will be on the other end of the power cord!!
That is my only suggestion. If you do not feel comfortable removing the cover, then you would have to pay someone to do it and since you can buy a new DVD player for under $50 these days, I doubt paying a repairman $75 just to look at it would be economically adviseable.