The failure is on the USB port but that is not used for the cube.

The main question: Is the proxy address and port on the cube correct, that is do they match the proxy computer. Is there something that is blocking the communications initiated by the cube to the proxy being blocked, either IP Address or port?

It is rather common to set the DNS to the router's on the premiss that the router will forward the DNS requests as necessary. All that is necessary is that the DNS addresses point to a DNS source, either on the local net or Internet. But they are only needed on the cube if DNS names are used on the cube, in this case all addresses are numeric octet strings and do not need to be resolved.

The DNS addresses look good, they lookup to resolver1.opendns.com and resolver2.opendns.com. But they are not needed because all addresses on the cube are expressed in octets, not DNS names.

I would change the cube's IP Address to another value not close to either end of the range and not in the DNS assignment range, example: 192.168.1.240. Insure your proxy computer's IP Address is static.

From a previous post:
It seems that there is an Android on WiFi router problem, It has to do with it ignoring the DHCP lease times.

Full information can be found on theAndroid Open Source Project – Issue Tracker:  ”DHCP client ignores lease time”: https://code.google.com/p/android/issues/detail?id=11236

Insure the proxy address is either statically assigned outside the DHCP pool or set to always get the same address from DHCP, this will prevent a new proxy address stopping mining.

Best guess is that you ruined that blade. Plugging it in while the cube was on will connect some of the connector contacts before others and apply voltages in an order that can ruin the board. Also best bet is that the capacitors are not the problem, more than likely it is some transistor based item like a chip. I would suggest _not_ ever plugging in the bad blade again--there is little to gain and it might cause more damage.

Just write the loss of the blade off to a learning experience.

My take on the "tinfoil cage" is that is is rather far-fetched. The only instance where I have seen this used is in scientific research with extremely sensitive probes (Squid ion channel investigation) and inside the antenna field of a 43,000 watt AM transmitter. There are just to many other failure modes that are well established. While the procedure will not hurt insure the airflow is not reduced thus increasing the chip temperatures.

It seems that there is an Android on WiFi router problem, It has to do with it ignoring the DHCP lease times.

Full information can be found on theAndroid Open Source Project – Issue Tracker:  ”DHCP client ignores lease time”: https://code.google.com/p/android/issues/detail?id=11236

One thing that may help is to make sure the Cube(s) and any proxy are on addresses outside the DHCP pool so there will not be any collisions.

With or without Android insure the proxy address is either statically assigned outside the DHCP pool or set to always get the same address from DHCP, this will prevent a new proxy address stopping mining.

The one thing that I feel would be helpful is an alternate method of configurations that does not require changing the router network. That is to directly connect an Ethernet cable between the Cube and computer. See http://zaph.com/cube section 3). In my case making changes to the router was prohibitive and using an Ethernet cable was the easiest option.

I used to have a little power supply that would also fix an irregular heartbeat in an instant and it won't happen again. A puny 4a but 25,000v.

I was always real careful around it.

Here are some photos of the PSU, not that there is a flip-up orange cover over the terminals. Still, not as nice as molex connectors but better than an octopus of unused cables.

Notice the red rectangle in the first photo, there is a voltage adjust, this can be used to makeup for any voltage loss in the connection cables—but be careful and have a good volt meter..

Notice the red rectangle in the last photo, that seems to be the same kind of over-current protection as in ATX PSUs.

There are 3 3300uf caps on the 12v output.

I just received a 12v 30a supply, the same one previously linked to at Amazon: http://www.amazon.com/gp/product/B00D7CWSCG. After an initial inspection I see no problems, seems reasonably well built. Unfortunately I will not get a change to try it out due to travel through the end of the month.

Some people have had luck removing the mining boards and replacing them one at a time to find a bad mining board.

It is very important to be completely methodical isolating variables. Test one thing at a time in order to eliminate any conflicts.
1. Mark each Cube and PSU so you can easily keep track: Cube #1, PSU #1, Cube #2, PSU #2.
2. Make the settings exactly the same on each cube if possible.

3. Turn off both PSUs
4. Power Cube #1, PSU #1 up and write the results down.
5. Power Cube #1, PSU #1 down.
6. Power Cube #2, PSU #2 up and write the results down.
7. Power Cube #2, PSU #2 down.

8. Swap the PCE-E connectors between  toned up with: Cube #1, PSU #2 and Cub2 and PSU #1 being careful to insure the connectors are moved to the same (left/right) connectors. The two PCI-E connectors on the Cube are connected differently internally.
9. Power Cube #1, PSU #2 up and write the results down.
10. Power Cube #1, PSU #2 down.
11. Power Cube #2, PSU #1 up and write the results down.
12. Power Cube #2, PSU #1 down.

Examine the matrix of results. At this point you should know which CPUs and PSUs work and which don't.
If it is a Cube you may need to perform a variation of the above with the Ethernet cables and Cubes.

The only concern I would have is if there is an over voltage crowbar circuit. If there is then is no concern for the Cube on failure. I think that the power supply is a switching supply and I an not familiar with the failure modes of that kind of supply, they may fail in a manner that does not produce over voltage. Linear supplies have a failure mode of the voltage regulator transistor shorting in-to-out thus producing over voltage.

If it is running and under maximum current I see no reason to think it would fail in a room temperature environment.

Sure it is lower cost that an ATX type supply but it is much simpler with only one voltage and no cost for a plethora of cables.

There may be concerns other than those I have considered and I would be interested in hearing them.

I just ordered one so I can inspect it and in a few weeks when I get a chance I'll try it.

I disagree with that view of Hippies. Today the term is Hipsters which is where the term Hippie came from. I'm not sure what to call the "save the earth" people.

The defining thing in the mid to late 60's was the Vietnam war, the draft and the soldiers (former classmates) who came home in body bags and this spawned the hippies and the music as well, it was a great time for music.

At the time unless you were enrolled in college with a full schedule or married you were going to get drafted and go to Vietnam. The draft boards were very corrupt, selecting the poor, black and those who had moved. The youth felt that they had no control over their lives. Starting a career was not possible because the draft was going to yank you away for two years, perhaps life. I got my draft notice, was examined, deemed fit, and when my induction letter arrived in the mail I "dodged" it—I joined the Marine Corps that day. Every thanksgiving I play "Alice's Restaurant".

I was not a hippie, I had a business designing and manufacturing electronic hardware. We made fun of the hippies but underneath that we were at least a little bit jealous.
 
I think this hits the nail on the head, from "Country Joe and the Fish:
Come on mothers throughout the land,
Pack your boys off to Vietnam.
Come on fathers, don't hesitate,
Send your sons off before it's too late.
You can be the first one on your block
To have your boy come home in a box.

Yep, basically 100% of the electricity ends up as heat—a real heater these miners. That is the main reason I will not be adding another cube.

What is the ambient temperate in the room the Cube is in?

1. Is there a way to safely power down the cube?
    Just flip the switch.
Just seems rough to turn off the power supply.
   Not really. It actually does not die an instant death, there are capacitors that will discharge slowly (slowly if you are an electron traveling at close to the speed of light that is).

Ken, wow!
Great cable harness, great find on the low cost PCI-E connectors. What gage wire did you use going to the power supply?

The thing about the "ATX" PSUs is that they are purpose build to power a computer, a Cube is not a computer and has different power requirements; surprise, there are problems. They are being used because they are inexpensive, they are mass produced and they are cheap.

In the "day" when I was designing electronics I was used to purchasing single voltage units with current foldback for over current and crowbars to prevent over voltage. They can still be purchased, Lambda is still in business. But the price is much higher.

But today one can buy a 12v 30a supply from Amazon for $25 to $40 +shipping, just search for "12v 30A power supply". They do not come with PCI-E cables & connectors.
Example: http://www.amazon.com/dp/B00D7CWSCG/


Some one should try one.

Note that ATX PSUs are supposed to have separate "rails", each with over current protection. Thus a larger PSU has more "rails" (PCI-E) connectors but each has separate over current protection.

Adding another scenario:
a) The relay closes
b) The PSU over current protection drops the voltage.
c) he Cube sees the voltage drop and opens the relay.
d) The PSU no longer has an over current condition, restores the voltage.
e) The Cube sees sufficient voltage, closes the relay
This repeats and the relay buzzes.