Failure Rate of PC Manufacturers?

The ever-popular Anonymous Coward asks: "Hello. We are conducting a write-up for our clients, however we cannot seem to locate any published failure rate of PC manufacturers. Google does bring up past PC Magazine articles - but nothing recent. Does Slashdot know of a way to find this information, as this strikes me as valuable information for the computer buyer. We sell many PC's (B3 VAR) and have done for the last 5 years. We can and will produce our failure rate info - why aren't the big companies doing so?"