How do i fix a rand McNally tdk 500 gps that won't turn on

go to their website and ask them

Conner to computer for updates

The answer to this question and many others can be found in the FAQ section on our support page at www.randmcnally.com/support. Additionally, for instructional videos on many of the TND & RVND features please visit the Rand McNally You Tube page at www.youtube.com/randmcnallyonline.
To correct the issue please perform a Diagnostics & Repair using the Rand McNally Dock. Step by step instructions can be found at - http://www.randmcnally.com/support/s/diagnose-and-repair
If the Rand McNally Dock does not find an issue with any files, the repair fails, or the Diagnostics & Repair does resolve your issue, please call technical support for additional assistance.

Technical Support is available:
Monday - Friday
7am - 6pm (CST)
1-877-446-4863
[email protected]

https://www.thetruckersreport.com/truckingindustryforum/threads/support-thread-for-the-tnd-500-tnd-700-or-future-rand-mcnally-products-part-two.255563/page-78

Well not sure that you posted this in the right section. If you are talking about a Rand Mcnally TND 710, then yes it won't give you text to speeech, that feature is not in the 710 the 720 or even the 510 or 520.

they do that so you will go by a new one by a cobra end of head aches

by a cobra youll sleep better at night

try to reset the device using a paper clip to press the reset button located on the side of the device case.
here is a link for the user manual http://d1h33o57i1sehj.cloudfront.net/TNDRestWebService/Manuals/IntelliRoute%20TND%20710%20User%20Guide%20Version%202_0_1.pdf

If it is more than a few years old then the battery is a real possibility as the problem.

Try pressing the reset button on the back or the side of the TND. If it still will not power on contact Rand McNally support. Be sure to have your serial number handy, (back of TND, bottom right)

Thanks,
Mark
Rand Lead Beta Tester