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Question: Does any one know if the grounded light doesn't come on if it is still protecting your appliance?  It cost more to ship it back than I paid for it.
Document: I have a laptop that i carry around the house from living room to bedroom constantly and i needed a surge protector that only took up one outlet just in case a power surge or lighting struck. this was the highest wattage i could find that also had a single outlet, was white to match my outlets, and had the grounded light to make sure it was protecting whatever was plugged into it. Being Belkin I knew this was a quality product and for the price it's perfect. Perfect for my needs.
Fridge is fine, and maybe it would have been without the Belkin Surge Cube, but I felt better using it. Hopefully, I will not be back to say it did not work. As an aside - when we tried it first in a different socket - the ground light did not come on, and we found that the ground wire had come loose. Handy little Cube.
I bought this product after getting my first Mac, and it was costly and wanted to protect it. When I plugged it in the ground light didn`t come on telling me my outlet that I had  my computers hooked up to wasn`t grounded properly so I fixed it, but without it I never would have known my electrical outlet was fishy. So just learning that was worth it and now it`s protected and I have peace of mind.
These are specified as absorbing up to 885 joules.These units also have an LED which tells you if your outlet is grounded, which is useful information.However, on one of the six units I bought, the ground LED does not illuminate. It's not worth the shipping to send it back, so I took it apart to see if I could spot the problem.
Got a new fridge and figured it would be smart to put a surge protecter on it after a transformer blew and the power surge broke every machine without one at work.I needed a small one to fit behind the fridge. Its not as flat as I would like but it fits back there and you can still use the plug above it.
I used one for each of my two garage doors, you never know when the power will be inturupted and possibly do damage to you door opener or motor. Just a few dollars to possibly protect a high dollor repair cost
And the one person I know who did, his electronics were unaffected by subsequent lightning strikes, but the surge protector was no longer protecting. Also, that client eventually installed lightning rods ;-)
I bought this surge protector to keep the circuit board on my brand new house furnace protected.First off the 2 green lights are a nice touch to keep a visual on it's operation.One green light tells you the ground is correct,the other tells you if the unit fried itself to protect your appliance.I use it on my new furnace, in case I have to run my generator due to power failure, to protect the circuit board.Should probably buy a couple more.
I generally didn't think surge protection was necessary, until my street was hit by lightning. I lost $400 in electronics (stereo, cable modem, wifi router, etc.). Neighbors had worse, losing TVs, home alarm systems, etc. In total probably $10k in damage across 4 homes.These have good specs in terms of protection, better than some larger units. They are very affordable. If you have an appliance worth more than the cost of the protector, it should be on one.
I bought several to use on various appliances. Washer, dryer, fridge and my air compressor. For about $5 each it's cheap insurance to protect the delicate electronics in modern appliances. I especially like the small LEDs to show that it's grounded properly and protecting.
Answer: BOTH lights should be on for it to be properly working.  It may or may not be protecting your appliance if both lights aren't on....I wouldn't take the chance since it most probably is supposed to be protecting an expensive appliance.  Try another outlet to make sure the problem isn't the surge cube.