I tryt to turn on my humidifier tonight.1st the mist was coming out just little bi,but there was no green light on,like the manual sed and the humidifier was making some wird noises too.

Here are the instructions for the Mainstays Cool Mist Humidifier 1 gal MDH-0103JW:

1. Remove the water tank by lifting it straight up and off the base.
2. Turn the water tank over and remove the tank cap by turning it counterclockwise.
3. Fill the tank with cool water and replace the cap by turning it clockwise.
4. Place the tank back onto the base, making sure it is seated securely.
5. Plug the humidifier into an electrical outlet.
6. Press the power button to turn on the humidifier. The power light will illuminate.
7. Press the mist button to select the desired mist output level.
8. The humidifier will automatically shut off when the water level in the tank is low.
9. To refill the tank, repeat steps 1-4.

Note: For optimal performance, it is recommended to clean the humidifier weekly. Please refer to the user manual for detailed cleaning instructions.

If it is an ultrasonic humidifier, it has a little disk about the size of a dime at the bottom of the well where the mist comes out. That metal disk gathers white scale on it, Clean that off. The best way I have found is with a Waterpik turned all the way up.

the little hose from the tank to the top is clogged

If you see mist in unit and not coming out fan motor in base of unit bad. Four screws in base and fan unplugs

Hi Lisa,

• Check that there is water in the Water Tank.
• 
  Make sure that nothing blocks the Mist Output Slots.
• 
  Check that the Fan Vent on the bottom of the humidifier is not blocked.
• 
  Empty the humidifier and rinse the Water Basin with cool tap water and allow to dry for 15 to 30 minutes before resuming normal operation.
• 
  Check for possible mineral deposits on the Water Level Sensor or the Nebulizer.

For more information, check out the owner's manual here. It is truly helpful!
Good Luck!

This page has 18 pdf user manuals they are only 1-2 pages each open them in adobe reader till you find the one you need wish i could be more help
http://www.holmesproducts.com/Manuals.aspx

According to the Crane's Troubleshooting section:
The power light is green but there is no mist being emitted:
- Check that there is water in the tank.
- Check for possible lime deposits on the water level sensor or the nebulizer.
- Make sure that nothing blocks the vapor output slots.
- Check that the fan vent on bottom of humidifier is not blocked.
- Empty the humidifier and rinse the water basin with cool tap water and allow to dry for 15 to 30 min.

This next part may or may not be relevant.
Humidifier power light is staying red and not turning green. Or, Humidifier is working then stops:
- Ensure that water level sensor is assembled properly.
- Clean water float.
- Call service center and request replacement water float.

Barring that, here is the service center contact info:
Dart Warehouse Corporation
Tel: 1-888-599-0952 (Business hours Mon-Fri 9:00 am - 4:00 pm Ct)
Website: http://www.crane-usa.com
1835 Ferry Road
Naperville, Illinois 60563