gib mal bitte in Terminal.app folgendes ein und poste das Ergebnis hier:
OK, das kam dabei raus:
Assertion status system-wide:
BackgroundTask 1
ApplePushServiceTask 0
UserIsActive 1
PreventUserIdleDisplaySleep 0
PreventSystemSleep 0
ExternalMedia 0
PreventUserIdleSystemSleep 0
NetworkClientActive 0
Listed by owning process:
pid 103(hidd): [0x001b86ac00098fd9] 00:00:00 UserIsActive named: "com.apple.iohideventsystem.queue.tickle.4294992966.3"
Timeout will fire in 900 secs Action=TimeoutActionRelease
pid 281(UserEventAgent): [0x000005e3000b8171] 1120:29:57 BackgroundTask named: "com.apple.mail.AttachmentMIMESnip"
Created for PID: 502.
Kernel Assertions: 0xc=USB,BT-HID
id=539 level=255 0x4=USB mod=01.01.70, 01:00 description=com.apple.usb.externaldevice.14600000 owner=USB3.0 Hub
id=540 level=255 0x4=USB mod=01.01.70, 01:00 description=com.apple.usb.externaldevice.14200000 owner=USB2.0 Hub
id=543 level=255 0x4=USB mod=01.01.70, 01:00 description=com.apple.usb.externaldevice.14240000 owner=Keyboard Hub
id=549 level=255 0x4=USB mod=01.01.70, 01:00 description=com.apple.usb.externaldevice.14610000
id=591 level=255 0x8=BT-HID mod=01.01.70, 01:00 description=com.apple.driver.IOBluetoothHIDDriver owner=AppleHSBluetoothDevice
Idle sleep preventers: IODisplayWrangler