In the end I had to turn it off 'manu militari' (= press power button for 8 seconds), and then I could restart the PC successfully. I repeated this procedure several times but was unable to wake the PC. I tried as before to send the PC to sleep again (which seemed to work: after a few seconds the HD shut down and the power light started flashing slowly) and then revive it again, but again the screen didn't come on. I tried the trick with the shortcut I had defined in ATI TrayTools to reload the driver (I use ctrl-alt-shift-R), but nothing seemed to happen. The mouse was on as well as the keyboard light, and the HD activity LED indicated there was some haddrive activity. ![]() My system (Dell Optiplex 960 with Vista 32 business, ATI Radeon HD 4370) has worked stable for a week or so, but this morning again refused to come out of sleep (hibernate).
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