Grey screen on booting. - Lenovo A7000 Questions & Answers

Hi guyz, I was flashing twrp recovery on my Lenovo a7000 with Sp flash tool. But I saw an error saying pmt change for rom something like that. Then I formated it with sp flash tool. When I booted my phone I saw grey color with lines on it. And also it vibrates when I I press and hold the power button to switch on it. I searched every thing on Internet about this. But nothing helped me. I also tried flashing different stock roms.
S144, S234. But same the screen bootup with grey. Before this I have also went through this problem and went to the store where I purchased this phone. They replaced the screen and it was good. Now I tried it again and ran to the same fate. Please guys help me. Is it the software problem or the hardware???. I really need to know. As I'm using my friend's phone because I have destroyed mine. Please help.
~~Xaid

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