Vtech flash won't turn on

You should have factory reset the phone and check if it's fixed. It might be that the phone operating system is corrupt so you need to format the phone by running a new file on it via flashing. Thank you.

Hi, bring to your nearest service center to repair it.

Is there a "tape monitor" button by chance? If this is turned on, it will mute your audio as well.

hardware issue i think

Quite often you may have to do the removal and restart your PC. Once you have done that, check your registry to make sure you have removed any traces of flashplayer. Before you edit your registry, make sure you back it up first. Should something go awry, you can go back and recover to the back up registry file. Also make sure you do one product removal at a time and check that the reinstall removed all pieces.

Since you neglected to specify the model of your VTech 5.8GHz phone, I can only direct you to enter it into the search box here to download a copy of the manual.

Not sure, but I've heard a bad hazard switch can cause strange problems.
Also, if your truck has a body control module that controls interior and lights, that may be your problem, too. Good luck.

Pull the SD card and it will start reliably. Incompatible SD card, get another.

Enter the model of your VTech DECT 6.0 phone into the search box at
http://www.vtechphones.com/vtechphones/index.cfm/support/general/manuals/
to get the manual for your phone.

You don't have to pay to post in FixYa's free area, as you've done.

There are problems with the power adaptors. Did you use a VSmile power adaptor, or something that just seemed to fit the unit? Using the wrong power adaptor (like unknowingly plugging a Leapfrog power adaptor) into the unit can cause damage to the Vsmile Board.
Push and hold the power (smile) button for one minute, then install fresh batteries. if it powers back up, then try:

Dirty Smartridges (the game cartridges) are to blame for about 90% of VTech Vsmile products not powering up.
In some instances, the cartridge slot on the unit itself can become damaged and will cause no power up.
Kids (of all ages) can dirty a smartridge in less than a second, and render the whole system dead.