HP pavilion slimline desktop computer

This PC is defective! My computer has required 2 mother board replacements during 18 months of ownership. HP will no longer honor any warranty even thought the computer has inherent problems that will cause another mother board failure, according to their own tech support staff. I was told that the slimline design has resulted in major components being placed too close together which causes a voltage surge and shorts out the motherboard. HP will not respond to complaints, so I guess I'm stuck with a product that was no good to begin with.