When mvp4 is turned on the battery lights come on and then go out and the speed indicator lights come on flash several times and then nothing.

The battery meter lights will flash a flash code when something is wrong. If the lights are flashing the same number of lights each time. get that number it is a flash code. if the lights are cascading up and down that indicates that the Joystick is locked. unlock by turning on the joystick and pushing the horn button twice within 10 sec. of turning on. Or push on button and hold the joystick gimbal forward until it beeps then back until it beeps. This should have it unlocked, if not Pride Jazzy Tech 800-800-8586

I’m happy to assist further over the phone at https://www.6ya.com/expert/bill_bcbb89783b08c489

Did you put them in the right way? did you check all contacts in the speed light / electro flash? is needed, please clean the contacts. If you did not use this speed light for a long time, some contacts (also from the switches) could be corroded. when you sure you have the right batteries, correct inserted, and it won't start. try pushing the on / off several times. ( no pressure will be needed)
Don't use manganese (Zinc-Carbon) batteries. Best choice would be NiMH.

You may need to remove all the power from the device including the CMOS Battery. As well try using an external display to see if there is any display.

I'm guessing it's out of battery. Try plugging in the power cord and let its battery charge for 5 minutes, then hit the power button.

Flashing orange light generally indicates battery low charge could be your battery at fault
the next time you try and power on and it doesnt work, take the battery out (unplug AC) and try to run just on AC power
hope helps, let me know if can help further

According to the owners manual for these swimming pool lights, this is what each colored indicator means. Hope this helps.


Solid green
The battery pack is fully charged.
Slow flashing green
The battery pack is almost fully charged.
Slow flashing yellow
The battery pack is half charged.
Medium flashing yellow
The battery pack is less than half charged.
Fast flashing yellow
The battery pack has almost no charge.
Fast flashing red
A charging error has occurred and the light should be unplugged and then plugged back in. If the Fast Flashing Red persists after several attempts, the battery condition is questionable.



Also in the trouble shooting guide, it mentions this:


Problem: Red Indicator Light Is Flashing While Charging

Solution:
A red flashing indicator light when charging indicates a selftest
error condition. Unplug the product and plug it in again.
Try this several times; if the indicator light continues to flash
red, unplug the GlowBuoy and take it to an authorized service
depot.

Make sure your batteries are inserted properly (+/-) Slide the battery cap on and off several times to make sure you have good contact.

this is most likely the sustainer board(s) problem. Replacing the sustainer boards should correct this problem for you. you can get the parts at vancebaldwin.com

The red or amber flashing lights indicate a bad battery. The Dell battery warranty is only for one year and the D600 has been out for a number of years. You should replace the battery. You can use the laptop as it is as long as it is connected to AC power.

There are several places to buy replacement batteries. One is www.bixcomputers.com. If you do a search on the web you should be able to find other sources.

Good luck and I hope this helps, even if it isn't good news.

That red button ur talking that flashes several times indicates that ur battery is dead, and it has to be charged...

Anyway if that doesn't work then u'll have to flash up ur mobile at a trusted sony ericsson support center...