Hi all, After about 15 weeks of no use (set theory course this term), my TI-89 is now completely unresponsive to any input. I have tried removing the batteries, holding down + + [2nd] + [on], and [-] + [)] while reinstalling one battery as indicated in the owner's manual. I have also tried the "blow hard into the USB port" solution. None of these have worked for me. My problem is essentially the same as those outlined http://ti-89.org/forums/topic894-ti89-frozen-keys-ignoring-no-os-no-busy-no-reset.html" [Broken]. Any advice would be very welcome! -- Ad Astra!