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Most likely the power board is defective. A new power board will cost $40 to $100 depending on your model. ShopJimmy.com is a good place to look for boards. They are not too difficult to replace if you have a minimum of electronic repair experience.
Are you using a HDMI cable? Push the SOURCE button & select the corresponding HDMI input with the HDMI input from your DVD player. The HDMI inputs on the tv should be numbered & you can then select the correct number HDMI on the source screen. Good luck.
Try using a paperclip to reset it on the back, hold it in for 5 seconds, if that doesnt work: Turn the tablet all the way off, press and hold the VOL - and power at the same time for 8 to 9 seconds, it will show a green android guy with a system recovery menu. Use vol - to go down to Wipe Data/Factory Reset, press the power button to select it, go down to 'yes' to confirm, press the power button to select it, it will wipe the tablet, you then press the power button on 'reboot system'.
If you wish to get more details, check this site. Pull up older posts there. Check the site with patience, as it has over
2250 posts now. All are related to
electronic equipment repair help.
Search the site by 'Timeslide' option.
It will make search easy. Or,
type in the brand name to your device into its search box, and press "Enter"
i have a coby 26 , I know sorry about that, but if any can help I appreciate it . turned set on today and green lite only no pic/sound/snow did have a horizontal red line for a few days prior to today.