Does the clock reset every time even with a new battery and just in case did you try a second battery in case the first one was not good?

Examine the board, look for anything that looks like a leaking or bad capacitor or any insects or critters that could have gotten in the system and done some damage.

Any add in cards that you can try with other known good cards?

Are there power saving features enabled in the BIOS? 

Will the computer have the same startup behavior if you do a complete shutdown instead of going to sleep?

hi, thanks for input. I checked another battery, same thing, it seems that the MB don t have any signs of damage. I do not see any capacitor burned. I tried 2 video card that works on another PC. I really don t know what happened.

If ido shut down is the same thing like sleep. No start until unplug the power with bios reseted at default. All the time, I have a power led blink fast one white and one yellow, no blink for 10second, and again white-yellow, and same pattern. In this time, fan of CPu turn at blinking, and stopted on no blink,  and start again and stop. Is like it want to start but something is stopping it.

I will like to update the bios in case of corrupted bios, but no any luck. .Any thought for updating the bios? Anyway I cannot change anything in bios, since after exit bios, pc restart and no power on. Same pattern blinking white-yellow,

https://www.dell.com/support/article/us/en/04/sln290472/precision-workstation-t1650-power-button-diagnostic-led-status?lang=en

Look at this doc and find your pattern of blinking lights.  It should get you closer to the problem