This forum thread and this one may help.

Thank you but he is really stuck at the Dell logo and does not load any troubleshooting, neither the bios nothing. So I can not start from live usb or something. All ready tried 3 different hardddrives, nothing

Welcome to the Dell Community 

Hold down the "D" key, push the power button, release the power button, wait 2-3 seconds and release the "D" key

The laptop should go through an LCD test of solid White, Red, Green, Blue and Black 2 or 3 times.

After completion it should try to automatically boot 2 or 3 times.

Give it time to complete the test and boot.

Best regards,

U2

@Mailf 

If you have 2 sticks of memory installed try using just 1.

Regards,

U2

Power up with d key gives some lcd colors, but I still does not boot or go into bios after that. Still hangs on the Dell logo (status bar half way) 

It has been sitting there for 20 hours, so it really does not get past that Dell logo screen. Even with the hard drive dismounted or other hard drives in, nothing works... 

Yes it looks like it, I already tried that with the cmos removed he first tries to power on 2 times and shuts off, after that he powers up with screen and gets the Dell logo again, so not like in the video

Also sometimes after hard resets en cmos unplug it get past the Dell logo with only 1 blinking - sign left on the screen.... Like in the picture, but nothing happens. 

Hello,

It looks like your system is unable to complete it's post have a look at this video 

Thanks I already tried swapping the ram, wapping HD, removing network card , also that does not work.