All warning lights are flashing on the dash board an the car won't start

I would check the headlight switch

Are you referring to warning lights on the dash board? The flashing battery light may mean you have a charging problem and the flashing brake light may mean you need break fluid or have an other brake issue. Take it to a service station or the dealer. Or read the owners manual.

The warning lights should be listed in your owners manual. It could be a warning for one of the gauges, or engine/transmission problems.
They are more common on Toyota Prius.

1. So the car was running normally and then on one occasion you put in the key to start it and all the warning lights flash up on the dash and the starter motor will not turn the engine over. Is that correct.

2. When you last drove the car were any warning lights appearing on the dash.such as check engine warning, engine overheating, electrical charging warnings etc.\

3. Has any work been carried out on the car recently.

4. How old is the battery in the car.

have battery tested if good fully charge,then check all relays and fuses.

Whenever this warning light or any other stays on in the dash it is indicating that the systems control module (or the system sensor in the case of lights like low oil pressure, door open indicators etc.) has detected a fault, it then disables the system (this applies to ABS,TCS, TCM, SRS and BCM faults and others) as long as the light is on. You must now have the dealer hook up a special electronic diagnostic tool and "scan" the system for the fault code that is stored for the problem(s)

Legend of Abbreviations. ABS Antilock brake system.TCS Traction control system, TCM Transmission control module, SRS Supplemental restraint system, BCM Body control module

Bulbs maybe burned out or a wire for the dash has broken or a bad solder joint on the circuit board make sure you use a continuity tester on the fuses sometimes they still look good but are bad check all the fuse holders for the instrument cluster a loose fuse or bad corroded wire Wil knock them out also follow the wires to the connections from the fuse box the contacts can be corroded

There are few help links provided to resolve this issue of dash board light not working.Click the link below to go through its procedure:-----Dash board lights not working? http://repairhelpcenter.blogspot.in/2012/02/dash-board-lights-not-working-on-gmc.html
----------- light in the dash blinks? http://repairhelpcenter.blogspot.com/2012/01/overdrive-light-in-dash-blinks.html
-----------Orange O/D warning light flashing on dash? http://repairhelpcenter.blogspot.com/2012/01/orange-od-warning-light-flashing-on.html
---------gauge on the dash quit working on? http://technoanswers.blogspot.com/2012/01/temperature-gauge-on-dash-quit-working.html---------No 4x4 light on dash? http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html
----------Digital Dash Display not working? http://schematicsdiagram.blogspot.com/2011/12/cadillac-seville-digital-dash-display.html
---------warning on dash and alarm sounds? http://schematicsdiagram.blogspot.com/2011/12/chevrolet-tahoe-hood-open-warning-on.html
---------Light Stays On dash of car? http://schematicsdiagram.blogspot.com/2011/06/brake-indicator-light-stays-on-dash-of.html
----------The ABS and Traction Control Lights stays ON dash of car? http://schematicsdiagram.blogspot.com/2011/06/abs-and-traction-control-lights-stays.html
----------warning lights remains steady on dash? http://schematicsdiagram.blogspot.com/2011/12/abs-brake-warning-lights-remains-steady.html
---------light bulb under dash replacement?

http://schematicsdiagram.blogspot.com/2011/12/heating-knob-light-bulb-under-dash.html

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Parking lights, tail lights and dash lights not working? http://technoanswers.blogspot.com/2012/01/parking-lightstail-lights-and-dash.html

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How to replace Instrument panel and dashboard?

http://repairhelpcenter.blogspot.in/2012/02/how-to-replace-instrument-panel-and.html

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Tail lights and dash light fuse keeps blowing? http://technoanswers.blogspot.in/2012/02/tail-lights-and-dash-light-fuse-keeps.html

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This will help.

Thanks.

check your battery cables make shure the they are not loose and r clean

flashing dashboard lights when the ignition is turned off