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These laptops had terrible overheating problems and were, at one time, being repaired free of charge by HP so it's worth visiting their website, searching for dv6000 overheating and following the links to enter your serial number. You may find you're still eligible for a free repair.
It's also worth checking the memory by finding and unscrewing the right hatch on the bottom of the case and taking one sttick out to see if the other works. Swap them round if that doesn't help.
Hey thanks for the tip will try it thanks again