Lenovo Z500 unbrick help

[hammerhead]

To begin with, I don't know if this is the right sub-forum to post. Please correct me if necessary. 
My sad story begins here: https://www.bios-mods.com/forum/Thread-R...45WW-V1-18 .
The guy did a good job, I flashed it, changed the wi-fi card and all went fine.
Until one day when I disabled the integrated Intel GPU from advanced bios menu. Yeah, stupid.   I was thinking to use only the Nvidia card... 

So now the laptop is not booting. Just a 3-5 seconds attempt, with black screen, fan working for even less than that, keyboard lighting up. Then it shuts down.
If it's plugged in, it will keep rebooting until it stabilizes with fan off, HDD seems to be on judging by the sound of it, keyboard light up, black screen. 
I cannot enter bios menu blindly in order to reset it with F9 and F10. I don't think it gets to where I could press F2, it shuts down too fast. 

I then took the motherboard out and removed the 3V  battery. Still no luck, it was the same.

Then I got in touch with the great dude that modded my bios and he told me that I have to rewrite the bios onto the chip using a spi-programmer.

So I went to a big, certified service in my town (Cluj-Napoca, Romania), explained the problem to them and waited for 6 days. Today I went back to them and I was told the motherboard needs to be changed. They rewrote some original bios version and it's still the same problem, so they told me. I was quite skeptical and told the technician to explain it a bit to me, but he just bragged a bit about it, no real explanation of what could have gone wrong and how is this suddenly a HW problem. I don't know how or if they rewrote the chip(s). Maybe they want to sell me a motherboard and that's it. I'm not buying it either way.

Also, can you tell me if there are two chips, or only one with the bios on them? I am not certain what motherboard version is in there, but from my searches it could be this: http://www.rom.by/files/compal_la-9063p_...matics.pdf . 
The modder told me this: " your bios chip W25Q32BV    ID:0xEF4016 Size: 4096KB ".

So now I'm asking you what to do, since I won't buy a new motherboard, I'd better buy a new laptop for what it's worth.

Tomorrow I'm going back to the service with the modded bios that I still have and ask them to flash it in front of me, since they say their clients can do that. If it won't boot after that, I'm out of ideas...
However, for my own knowledge, I'm trying to understand how could this be a HW problem, I mean it didn't boot right after I rebooted from bios with the disabled GPU. Is something like this possible, a trashed board because of that? I'm having a hard time believing it and the modder also. I kept writing emails to him and he is quite prompt. From what he told me, the board is fine, just the bios needs to be written with a spi-programmer.

Are we right? Please, help ! I'm in a mental breakdown, my Nexus 5 decided to die on me too.   
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final edit: I got it out if the service, bought a CH341A programmer with clip and solved the problem. huh.