Hey Firmy,
Who was this
Engineer who tested your chip, as the others have said it's pretty hard to kill a processor. A chap called Peanut made a similar post to yours a few months ago, he had been told by a technician at his local computer shop the chip was dead so I got Peanut to send me the supposed dead chip and it worked fine!
I would recommend you find someone with a LGA775 system that will test your chip before you pay out good money only to find out the problem is still there!
If the chip is actually truly dead and you need a new one then look no further than a
Intel® Pentium® Dual Core E6300http://processorfinder.intel.com/details.aspx?sSpec=SLGU9 as its slightly better than the older E5200/E5300/E5400.
Deffo get the older chip tested first by an overclocker before you purchase a new one!