Id need to know more about whats going on. If your screen is flashing or the red light on the console is flashing you generally need a new 72-pin connector. Now if your not getting any power (no lights or flashing on TV) then its a bit more complicated. Getting a new power adapter would be my first move. If not you would need to open the NES Nintendo and test a few things with your power source and the motherboard. Hope your just getting a flashing light, easy fix.
nintendo
http://www.racketboy.com/retro/nintendo/nes/2008/03/best-nes-emulator-for-nintendo-ds-nesds.html
An original Nintendo NES is no longer available at retail stores, but they can still be purchased online. eBay has a list of used or new Nintendo NES's one can purchase.
Nes? Isn't that Nintendo Entertainment System? :o
NES (Nintendo Entertainment System)
No there not.
Nintendo Entertainment System
The Nintendo Entertainment System (NES) was introduced in 1985
NES (Nintendo entertainment system), SNES ( Super NES), N64 (Nintendo64), NGC (Nintendo GameCube), Nintendo DS ( DS Stands for digital screen) , Nintendo DSL ( DS Lite), WII And DSI (DS & I had NO meaning! In English!!
The NES cannot play Nintendo 3DS games. (Obviously)
Nintendo introduced the NES in Japan on July 15, 1983.
Nintendo introduced the NES in Japan on July 15, 1983.