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Is the power coming into the system? Does the charging light lights on?
If it is the case then replace the charger.
If it is not the case charging circuit should be replaced. Small work not very costly. But if you entire motherboard is damaged by high voltage or a fluid contamination or ants going into the motherboard, then you will have to replace the motherboard.
This message means that the cars battery charging system (CONSISTS OF ALTERNATOR) is not being regulated properly, the voltage output of the engines Alternator exceeds it's design spec. This can be a false warning or the real thing, if it a true high voltage condition then you risk damaging the various electric and controls modules in the vehicle. O'reilly and Autozone parts stores will test your charging system for free and report the findings to you. I strongly system you attend to this ASAP to avoid possible damage to voltage sensitive modules and electronic component's.
Possible failure of the processor. You can shut down, power off the unit completely. Allow time - few hours - for the voltage to drain off thereby resetting any error voltage on the processor. Now repeat the resetting when you power and if there is no response the chances of the processor or motherboard having errors/damaged components are high which will require a voltage/signal/logic trace in the processor
Check the supply voltage to the backlight LED's. If it's too high and thus causing the LED's to go open a new panel will just become junk when powered on, and you may have damaged the replacement panel you already tried. To check the voltage just measure it at the cable end you connect to the panel. If no voltage bad motherboard. If too high still a motherboard issue, but you might be able to regulate it with a simple solid state voltage regulator.
Yes you can. Any DDRII RAM can function at 1.8v. Every memory module has profiles written into it, this allows it to function at various speeds and voltages, and 1.8v is the default voltage for DDRII.
Voltages above 1.8v are used for overclocking, to take full advantage of high speed DDRII memory you should manually set the voltage and frequency in your motherboards BIOS (accessed by pressing DEL or F1 during boot), if your motherboard does not have options to set these parameters manualy then your memory will function at the default speed and voltage
Use AGP 4x card. It can either be 0.8V or1.5V.
Using the wrong voltage card with the wrong motherboard may result in damage in board and card.
Also, if you install a card that is not compartible voltage with motherboard specification, the card will not run.