MP3 won't connect to my pc

Question

can someone help? i have a samsung yp-K5 mp3 player and can't seem to get it to work on my pc, i used to be able to but all of a sudden when i connect it to the pc it's nowhere to be found do cannot download any music or do anything with it, any suggestions? -- APunable to connect to pc or charge when plugged into usb and mp3 screen flickers on like it want to start and notifies me about a mtp file?