Blinking amber light on the front of Dell TPAM appliance.
According to the Dell manual, this indicates a possible hardware fault / error condition.
To resolve this, examine the appliance for any obvious indications of hardware issues. Is it overheating? Can you smell anything unusual coming from the appliance?
You can also trying opening the case and verifying that there are no loose connections. Check the fan cables to make sure they are secure and that the fans are working.
If you have done all this and there is still an issue, you may have to RMA your appliance. Contact Quest Support for hardware replacement.