Command dial The command dial has fallen out. It doesn't appear to be broken, but won't engage when re-inserted.

Does the wheel you took off only have one centre nut?
If so it whould appear that you may not have put the key in the keyway of the shaft and the wheel when you put it back on. Maybe the key was in the wheel and hs fallen out at the repairers.

Is this washer new if so should be covered by warranty if not attempt to take top off the way that dials turning it looks like it aint making connection at back of fascia may have popped out at back of dial knob

remove it and bang it while it upside down something might have fallen into it like change

Sounds like your blades are either dull, misaligned, disengaged or broken. Examine your serger book for how to re-engage the blades. If they are engaged, make sure they are aligned correctly. If that still doesn't help check for damage.

Try replacing the solenoid. If that doesn't do it, replace the starter.

dont worry about vac hoses as they are redundant with manual lock. i changed to manual and all fine so definately back differential or transfer case

what device? is *********** board won't start? Or a hardware doesn't start like ram or your printer
If the problem is your motherboard check all your hardwares and connectors like this:

1. If the motherboard won't start if you click the power button check the LED(the small light bulb on your motherboard) if its glowing. If not, check the connector of your power supply or check the power supply if its working by looking its fan if revolving.
2. If you push the button and there's a sign of power but didn't start up that will appear on your screen check the connection of your monitor screen to your desktop computer. If it's connected, remove your RAM from the motherboard and insert it to another memory slot to check if it's broken.
3. Last, if you push the power button and here 1 short beep but the boot screen didn't appeared from your screen check your graphic card. Remove the graphic card and re-insert it again to its graphic card slot and plug in your monitor connector to it. If it still remain that way, buy a new graphic card.
   

I have a YTH 150 with a similar problem. The mower has an electrically powered clutch which is activated when you engage the blade button. If the drive belt has no tension on it, engaging the clutch doesn't do anything because the drive wheel will just spin but the blades won't. Look for broken tension springs on the mower deck and replace.

You must lock the aperture ring to f/22, so the camera can engage the aperture adjustment lever on the lens. Then, you can change the aperture with the command wheel.

When you change the aperture with the command wheel the aperture ring on the lens doesn't move when the camera actually adjusts the lens aperture.

Take the lens off and locate the aperture adjustment lever on the lens mount.

Unfortunately, this won't work with older AF lenses. So if you are using an older lens, the only thing you can do is change the camera setting to M (Manual) to adjust the aperture on the lens yourself.

how much voltage does battery have? should show 13.2 to 13.6 volts....