Hello,
Using one of those working outlets, please take notice of whether on not the green and red LEDs are light when the device is powered on. If the lights are on when the device is powered on then the issue likely lies with the internal cabling or the heating pad. If the lights are not turned on when the device is powered on then the issue is likely with the power cable or the motherboard.
Please use the following link to properly troubleshoot any of the above issues.
[[Fahrenheit FHT 125PRMR Troubleshooting]]