elitebook 8770W wont start after set to UEFI Native

[AlexSzoverfy]

Hi Merry Christmas to everyone! (Sorry for my English im just a beginer)
Please help me , i have the folowing big problem. today a reset in the bios to UEFI NATIVE, after saving no more pictrure on lcd screen, only  black screen, the 4 leds from right side continuosly light : wireles, internet and calc light white, the speaker led  amber and no boot proces. Please help, how can i reset motherboard  bios to main settings?. Ist any posibliti of key combinations or any other , i try the folowings: to push continuosly 15 sec , disconect CMOS baterry, and to the same, no result, tryed with batery only or with batery and power supply or only ac power supply.
I have instaled cpu I7-2820, ram 8 Gb , VGA-Nvidia  M4000, i wos have similar problem earlier , and i change the video card to ATI , thinking mybe vga defected, and Eureka ...notebook worked, buyng another M4000 worked wit this , but ...even with the old M4000. So i supose mybe some very strange erorr. 
Thank you very much in advance for any help.
Hish Mary Christmas . Sándor Szövérfy

[Jupitero]

Hello.

This very much sounds like a hardware issue. Could be many things. Try reseating the memory modules, or if you have multiple modules, try booting the computer with a single memory module and in different slots. 8770w has four memory slots, two under the keyboard, and two at the bottom, (if I remember correctly). If you can, also disconnect all other devices that are not essential to booting, such as HDD, Bluetooth/WLAN/WWAN modules, mSATA card, optical drive.

I'm not sure if 8770w can work without the Nvidia/AMD discreet graphics card, but worth a try that one too. The Intel CPU has its own graphics core, and may be able to output graphics without the added GPU.

HP laptops should also blink the Caps Lock light in a specific pattern if a hardware problem is detected. Here is an old post describing the light codes:

https://h30434.www3.hp.com/t5/Notebook-Boot-and-Lockup/Need-help-interpreting-CAPS-LOCK-blink-codes-...

Good luck!

[AlexSzoverfy]

Thank you very much for your help!.
I apreciate that list very much. So i can recomand this metod to other peoples with the same problem, i have been dowint 3 times the same proces, unfoertunate the notebook dismount and remount proces is a longer proces , and of course only for thosse whoo know what tey are dowing. So i do not recomnend this  way to others who are not specialized  on working with ESD and not quualified.
I wos try to find another way to reset the notebook without this process, but i could not find.
I already solved the problem changing the nvidia Quadro 3000M.
So i change the vido card ti ATI Fire, start the notebook picture OK , entering to CMOS setting and set back from Native Uefi to Uefi with CMS support, save setting, change back to Nvidia Quadro 3000M , and working like earlier. From where is comming i do not know, the cpu i7-2820 and quadro 3000M comination must somehow create this erorr .
Best regards to everyone, and happy new years .