Solve : Signal Problems?

1.	Solve : Signal Problems?
Answer» Starting about 3 days ago whenever i try to play video type FILES my moniter turns black and the "No Signal" message APPEARS and I have to restart my computer. And starting yesterday sometimes it happens and random times. I'm not very computer smart so any help/thoughts would be greatly appreciated. Thanks in advance.check cable connections.......tower/desktop to monitor.. have you added a NEW vid/graphics card?? does your keyboard/mouse work!Yes, i've checked all the WIRE connections and they are all hooked up properly. No I haven't added anything new and everything works fine up until the point the signal stops in which CASE I have to restart in order to regain the signal.How old is this system??

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