Dell N5110 stuck in Dell logo

Hi guys, I got a system startup problem with my dell inspiron n5110 i7 . Recently it started having severe issues at startup. I only see it gets stuck at Dell Logo in 1/3 on it way (using win 7 home premium). Formerly sometimes it just magically starts up just fine without any issue but lately it does not start up at all! I tried re-installing windows and rest to factory settings too but of no use.
Another thing is that one of my usb 3.0 ports (the one on the right side of the laptop) and my usb 2.0 and also eSATA port and Memory card reader stopped working like a month ago however when I connect my External HDD which is UBS 3.0 both USB 3.0 ports are working! And also when I connect my Cellphone in USB 2.0 port it did get charge but without recognizing. I tried everything driver re-install BIOS update factory reset and all but it didn't work so I just let it go n since then I have been using remaining ports (one back side next to network port )
Thanks for being so supportive
 
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