Most of Hp's problems were caused by certain Nvidia GPU's developing poor connections, but the the same thing happened to Dell, Sony, Acer and older MacBook Pro's and others. Google "Nvidia lawsuit" for more info. The model I recommended ( HP Probook 6550b) is not on the "list" and at this time I don't have any to sell so I wasn't looking to make a sale. BTW, the affected units can often be repaired by reflowing or reballing the GPU, however results can be mixed, a simple reflow often fails in a year or so. Reballing usually lasts longer.