Does not start

With a good fuse and battery, the B terminal of the start switch must be 12V (battery voltage) else bad wiring. I assume the mower starts/runs so this is FYI.

With power at the start switch B terminal, place the start switch in the run position, there should be 12V at the A (accessory) terminal of the start switch. If not, bad switch.

Next, the PTO switch B terminal gets power from the start switch A terminal. If power at start switch A terminal and no power at the PTO B terminal then there's a wiring issue between the PTO switch and the start switch terminal A.

Comment with results and I'll assist further if need be.

Does the engine turn over when you try to start it? Or is it just dead silent? Your engine requires a lot of power to start, where the lights on your dash/etc require very little power. It's not uncommon for the battery to be able to power everything in the car but not have enough power to start the engine. Check the voltage at the battery when you're trying to start it. it should be around 12 volts. Try a jump start if you don't have a voltmeter. If it starts when hooked up to another cars battery then your battery is the problem.

= if your laptop computer will not start =
laptops have power supplys that can lock up
the power adapters conectors break all the time 
and the batterys are designed to be "con$umable$" 
so 

- - -- - -- - -power reset - - -- - -- - -- - -
remove the power adapter's wall plug & 
leave the power adapter plugged into the computer 
but pull the laptop battery out of the laptop.
press the power button just like you are trying to start it 
but press it longer, this will drain & reset 
the internal supply, now relese the button.

-- - -- - -power adapter only test - - -- - -- - - 
reconnect the power adapter's wall plug 
press the power button to start it with just the power adapter , 
If the power adapter starts the laptop on its own go down to  
"If the computer can be started"

If the power adapter does not start the laptop on its own 
leave the power adapter plugged into the computer but 
remove the power adapter's wall plug & press the power button 
just like you are trying to start it again, 
then relese the button 

- - -- - - battery only test - - -- - -- - - 
unplug the power adapter & put the battery back in  
press the power button to start it with just the battery

if the battery starts it on its own go down to 
"If the computer can be started"

if the battery ALMOST starts it on its own 
DO NOT BUY A NEW ONE! it may only be discharged 
locate another laptop just like yours and charge it, 
and yes this is crazy and yes i am sorry!.

- - - - - - - - - - - - - - - - - - - - - - -
- if your laptop computer cannot start at all - 
- - - - - - - - - - - - - - - - - - - - - - -

this can be caused by a bad; 
connector ($5-$60), power adapter($5-$60), 
battery ($70), internal supply ($40-$90), 
or main/mother board ($100-$300)

If the internal power supply is bad or if the 
power conector fails at random (intermitant) 
most of the cost is determined by how dificult 
finding parts and dismantling the laptop is 
and if it's external or internal 

Make sure the connections to the battery are clean,and the battery post,no grey,or black residue ,this acts as an insulator.Check the ground connection,to the engine.

It sounds like a bad power supply the DVMRE requires a 5.2amp power supply alot of the older models have a lower rated power supply 9 out of 10 times this start up problem can be resolved by replacing the power pack.

Have you checked for a Firmware upgrade for the unit?

How old is the unit, it could be a bad battery.....

does it run with the power cord plugged in? if so your batterys dead, otherwise harddrive/bios/motherboard fault? is your power supply charging the battery?

change the power section capacitors..

Shut down the PC by manually powering it off by holding the power button in until it is off. Start the PC. Does it boot correctly? If so, turn off all the Vista power modes.

Click on Start and in the "Start Search" block type "Power". Click on "Power Options" which should show up above the Start Search area. Put the dot in "High Performance" then click on Change Plan Settings, Change Advanced Power Settings, Click on Power Buttons and Lid, Start Menu Power Button, Click on "sleep" to reveal the other settings - select "Shut Down", then "Apply" then "OK". Close all open windows and shut down the PC using the Start button. Note the power button icon is now RED not amber as before.

Run the PC in this mode and see if the same problem occurs. If so, you have a different problem.

Apex44

If you got the store bought APC 350 UPS, you most likely overloaded them, and killed them beyound repair.

People should never buy a 350VA. They are way to small for power supplies most of us now have. you need to start out to 1000VA plus you need to do the math to figure out how big of a UPS you actually need in the show room.
What am I talking about? What is the significant, or the math of what I am saying here. 115V x 1 amps = 115VA x .778 power factor = 89.47 watts Start up 50 watts = 39.47 watts
115V x 2 amps = 230VA x .778 power factor = 178.94 watts Start up 50 watts = 128.94 watts
115V x 3 amps = 345VA x .778 power factor = 268.41 watts Start up 50 watts = 218.41 watts
115V x 4 amps = 460VA x .778 power factor = 357.88 watts Start up 50 watts = 307.88 watts
115V x 5 amps = 575VA x .778 power factor = 447.35 watts Start up 50 watts = 397.35 watts
115V x 6 amps = 690VA x .778 power factor = 536.82 watts Start up 50 watts = 486.82 watts
115V x 7 amps = 805VA x .778 power factor = 626.29 watts Start up 50 watts = 576.29 watts
115V x 8 amps = 920VA x .778 power factor = 717.76 watts Start up 50 watts = 667.76 watts
115V x 9 amps = 1035VA x .778 power factor = 805.23 watts Start up 50 watts = 755.23 watts
115V x 10 amps = 1150VA x .778 power factor = 894.70 watts Start up 50 watts = 844.70 watts
115V x 11 amps = 1265VA x .778 power factor = 984.17 watts Start up 50 watts = 934.17 watts
115V x 12 amps = 1380VA x .778 power factor = 1073.63 watts Start up 50 watts = 1023.63 watts
115V x 13 amps = 1495VA x .778 power factor = 1163.11 watts Start up 50 watts = 1113.11 watts
115V x 14 amps = 1610VA x .778 power factor = 1252.58 watts Start up 50 watts = 1202.58 watts
115V x 15 amps = 1725VA x .778 power factor = 1342.05 watts Start up 50 watts = 1292.05 watts
115V x 16 amps = 1840VA x .778 power factor = 1431.52 watts Start up 50 watts = 1387.52 watts
115V x 17 amps = 1955VA x .778 power factor = 1520.99 watts Start up 50 watts = 1470.99 watts
115V x 18 amps = 2070VA x .778 power factor = 1610.46 watts Start up 50 watts = 1560.46 watts
115V x 19 amps = 2185VA x .778 power factor = 1699.93 watts Start up 50 watts = 1649.93 watts
115V x 20 amps = 2300VA x .778 power factor = 1789.40 watts Start up 50 watts = 1739.40 watts