System Flickers when booting

[victor1655]

Not entirely sure if its a windows Or a Hardware issue.

My system has been doing something odd for the last couple of weeks,
My motherboard died 2 months ago so i had to migrate another board from a Lenovo M72e to My gaming case. I setup the board installed all the hardware and set with the same processor, and graphics card i was using on the old system. all was working well, then 2 weeks ago, i switched to another display as i setup both my Xbox and the pc on the same LCD TV. but as i had to do some cleaning i moved the pc back to the original monitor and a day later when i boot up the pc The system would skip the BIOS and go straight to the sign in screen, when it booted up to windows it would give an OUT OF RANGE OR NO SIGNAL message on screen then it would blink 2 or 3 times in the lapse of a minute then go back to normal and it will not give any more errors after that, but when i restart it does the same thing all over.

I tried restarting all settings of the NVIDIA graphics software, reinstalled it, revised the cord on the monitor, make sure that its propperly connected on the back of the pc and tried both DVI ports, i thought that as my card is already old i needed to give it maintenance, and disasembled it cleaned it and changed the thermal paste and still no luck, i did get lower temperatures and all but it still does the samething.

i installed the latest bios software from the lenovo page and installed the latest onboard drivers, but still no luck.

 

[victor1655]

noticed something.
The computer powers on but there is no power to the graphics card until the Login, its not that there is no bios, simply there is no signal from the graphics card until that point, i pressed the button on the keyboard to enter bios and it detects i did it and the screen goes black, but there is no Bios image. until i jump to the resume boot then i get the login screen and the no signal error goes away. also the flickering stopped when i opened my main account and loged in my Microsoft credentials. but still im getting no Bios menu and that worries me as i need it for routine maintenance and other adjustments.