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Last day I have changed video memory from the bios. I have changed integrated video memory from 128 to 1024.
Then I have restarted the laptop and it does'nt boot. when i pressed power button pc starts then suddenly it closes after one or two seconds it starts again and power offs. Sometimes it starts and power-offs forever ,sometimes it starts and hangs forever.
My laptop's model is ACER V3-571G. It has i5 CPU and 8 GB RAM. I think it has a Nvidia GT630M. My purpose was disabling the integrated intel graphics card.