The worst feeling is calling IT after you've power cycled, and they tell you to power cycle and now it works. I promise I'm not an idiot! I tried this already! You have to believe me!
I had the inverse case. A test unit I was writing firmware for wasn't powering up, so I called over the hardware designer to see if there was anything bad in the wiring. There wasn't.
He flipped the power switch (a rocker switch) fourteen times. On the fifteenth try, it powered up normally. He actually documented the issue as user error, and said that "the user turned the machine on wrong".
Thereafter after, the phrase "you turned it on wrong" was part of the company lore.
For those interested in the actual cause, many chips had a documented power on state. Some are power on high and don't require initialization, some are power on low, and require initialization, and the rest are power on indeterminate, which means no guaranteed behaviour, so it's best to initialize it anyway.
The designer used a power on indeterminate chip assuming it was power on high. As a result, it was basically luck of the draw as to whether it would power up or not.
The worst feeling is calling IT after you've power cycled, and they tell you to power cycle and now it works. I promise I'm not an idiot! I tried this already! You have to believe me!
That's the first rule of computers!
95% of all fixes
What do you mean it's not worling? Is it turned on? Is it plugged in the wall socket? With a cable?
I had the inverse case. A test unit I was writing firmware for wasn't powering up, so I called over the hardware designer to see if there was anything bad in the wiring. There wasn't.
He flipped the power switch (a rocker switch) fourteen times. On the fifteenth try, it powered up normally. He actually documented the issue as user error, and said that "the user turned the machine on wrong".
Thereafter after, the phrase "you turned it on wrong" was part of the company lore.
For those interested in the actual cause, many chips had a documented power on state. Some are power on high and don't require initialization, some are power on low, and require initialization, and the rest are power on indeterminate, which means no guaranteed behaviour, so it's best to initialize it anyway.
The designer used a power on indeterminate chip assuming it was power on high. As a result, it was basically luck of the draw as to whether it would power up or not.
The first rule of wizardry is to not reveal that it's 90% turn it off and turn it back on again.