Have 2005 yamaha roadstar wont start no power. Batterie and fuses are good any idea what would cause this
Here are a few things to try to help you diagnois your problem.  

1.Check for corrosion on battery terminals and the fuses.   

  

2.Fuses are good - Did you check the fuse on the top of the solenoid?   

  

3. Take a screwdriver and jump the solenoid wires to start the engine. If it starts, then your starter is good. (could be a bad solenoid - but lets check some wires first)  

 Your solenoid operates when you hit the start button.  

 Your start button won't work until you turn the on/off switch on.  

 Your on/off switch only has power when you turn the key on.  

4 Use a test light to test the following:  

 Right Handlebar switch house - Test to see if you have power to on/off switch - Turn your ignition key on & off to see the testlight come on - if light comes on that means your igntion switch is good. If no light, the problem is in the igntion switch. or the main fuse to the igntion switch is bad.  

  

 If the light came on then you have power to one side of the on /off switch - test the on /off switch by turning it on and off. When switched to on you should have power to the other side of the on/off switch which is sending power to the rest of the bike which includes your starter button.  

 Test your start button with the test light by putting the test light on the solenoid - Turn key on - turn on/off switch on - push start button and see if the test light lights up. If the test light lights up that means that your solenoid fuse may be bad. It is located right on the top of the solenoid. If the fuse is good then that means your solenoid is bad. Replace it with a new one.  

 If the Test light did not come on then your starter button is not making contact and needs fixed or replaced.  

  

So follow the power with the test light until through each component until you come to the faulty one.  

  

NOTE: If its a blown fuse, check your wiring. You'll have to find out why the fuse blew and fix it or your fuse will just blow again. Could be a short somewhere, installing a battery wrong will blow fuses.
if it doesn't turn over... it can not start!!... do you mean it cranks ok .. but will not start? how did you verify "no spark"?

if you do not have spark, you'll have to perform troubleshooting of your ignition system. 

you have a distributor, an ignitor, a coil a cap and rotor and a camshaft position sensor. if there is indeed no spark, these components will all need to be inspected. It could be a problem with static discharge , if so do the following.


1. Disconect the power cord


2. Remove the battery


3. Hold down the power button for 30 seconds , then release for 30 sec and then hold down for another 30sec


4. Plug in power ,replace battery and power on laptop.


If this causes no Joy try this.


Remove memory and reinstall one stick at a time, if there are more than 1 dimm of ram, try each stick in each slot one at a time to see if the memory is ok and to determine if one of the memory slots is bad.


Hope this helps A ignition is in two parts, where you put the key to turn it and a second part that is the ignition itself. Between the two parts there is a small flat pin or bar. This is where your problem is, the pin/bar is broken. You will have to replace the ignition to solve the problem. i don't think you're going to be able to fix it. can you drive the car? have it towed to a shop and get some help--you have a serious problem or several problems. problem is a bad capacitor on the power board. caution if repairing yourself as capacitors in tv's hold a charge long after set is powered off and can be lethal. 
  
 when looking at your power board for a bad cap look at the top of the capacitors. a bad cap will have a noticable "bulging" on the top of it compared to others. be sure to note polarity of capacitor (will have a "-" on one side indicating negative. to fix on/off issue simply unsoldered bad capacitor and solder in a new one with same voltage and capacitance rating being sure the new capacitor is oriented the same as the old one was before it was removed. take this to a professional that can properly diagnose this problem, this approach you're taking is going to cause more problems and cost much more than if the problem was diagnosed prior to replacing parts.
http://repairpal.com/buick-repair-in-new-castle-delaware try removeing the full stop in front of range hi everyone, just to close this topic, i could get a proper power supply and in fact it was the problem..

thaks everyone for your time and help ! re-flash bios using usb stick if you can get that far.
if not reset option and steps like clearing cmos and pins.?
new mobo or try manufacturer..