had this xps 8900 about 4 mo.from day 1 when ever i start computer i hear a knocking noise for a few seconds,and when than happens the quick launch icons disappear for a few seconds,also the computer is very slow.I hesitate yo call Dell support ,called 3 times talked to 3 different people for about 1 hr.,to finally get hung up on -this happen on 3 different occasions ,Dell support is not what it used to be i'm wondering if i have bad HD or video card..thanks for any help
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