there are growing concerns on the street that an expected slowdown in personal computer demand will have ripples for corning a key supplier of display glass earlier this month barclays analyst tim long cut his rating on corning ticker glw to equal weight from overweight citing concerns about a potential slowdown in demand for both pcs and largescreen televisions on monday citi analyst asiya merchant made a similar move for similar reasons cutting her stance on corning to neutral from buy while chopping her price