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Make sure that the fan is 12 DC Volts.. If that is 12 DC volts?... you can connect that fan to power supply of your desktop wired color (+)yellow and ( -)black. If its doesnt work... that fan is defective.
You will need a volt meter to figure this one out. Battery voltage? Should be above 12 volts, and while you are trying to "crank" the engine over, if it's still over 12, you need to see if that power is getting to the starter motor. If it goes below 9 or 10 volts, you either have a bad battery, or the starter motor is shorted, or bad.
To test the starter, you should have a large wire going to the starter that has 12 volts all of the time from the battery. A smaller wire will have 12 volts only when the key is turned to "start". If you have these and a good ground, the starter motor is bad.
if you take the cover off the receiver and look at the power board you will find evidence of overheating and probably some capacitors that are bulging. it's probably cheaper to buy a new receiver unless you are able to start replacing parts yourself. I found a overheated board recently that came from factory with R30 missing.
If you are using a switch between the viewsat and the LNB, remove it and connect the receiver again.
If that did not work, remove the cable from the LNB and power up again; if the receiver still unable to power up then you might have a short circuit in the cable itself or water might be entrapped inside the connectors on the LNB/switch connections.
Let me know if you need further assistance.
Check inside the receiver for a defective LM317 IC or a TIP42C transistor, but before that you should check for proper voltage from the power supply to that IC.
LM317/TIP42C control the switching of voltages that power up the LNB, you should be getting 14 volts for vertical channels and 18 volts for horizontal.