MacBook bootup issue\chime sound looping with Grey Screen

Hello,

I have Macbook Air mid 2011 (13 inches display) and while booting it goes in loop with chime sound heard again and again. I have already tried several combinations to boot it up in recovery mode, safe mode, reset NVRAM and SMC reset but nothing is really working.

Can anyone please suggest something?

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Some history of the problem (first appearance, suspected cause) also what OS you're using would be helpful for us.

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