It is not normal for it to run the disk check that you are seeing. It will always go to the login screen after that. I would imagine that something is corrupt on the drive.
You should boot into the Recovery HD by holding down cmd-r on restart. When you see the gray screen, you can release the keys.
Once booted into the Recovery HD, use Disk Utility to repair the disk.
See About Lion Recovery: http://support.apple.com/kb/HT4718
Currently Being ModeratedMay 2, 2012 12:56 AM (in response to Barney-15E)
Many thanks, Barney-15E for your suggestion.
I've booted into Recovery HD utility, but the disk check didn't find any error on the disk, but anyway I've perfomeed dsik repair.
The malfunctioning described is happening since many time ago, when was running the last Leopard version.
I supposed to solve this annoying boot malfunctioning with Lion OS upgrading...but with no success.
One day of last february was not possible to start Imac in anyway due disk trouble with no possibility to repair.
Apple service retails center reinitilized the disk with consequent Lion OS installation...but now here we are...
Now I suspect some hardware trouble on HD.
You can insert the Original Installation Disk that came with your computer and run the AHT (Apple Hardware Test) or the Extended Apple Hardware Test to see if any components are failing.
Hope this helps
Currently Being ModeratedMay 2, 2012 9:00 AM (in response to Radiation Mac)
I've ran AHT (through the original CD supplied with IMac).
I've performed the complete test, in order to have full machine verify.
At the the no any hardware fault has been detected. At the end...everything seems to be working properly...ma it doesn't...because the "disk chek bar" appears often when I boot my Imac.
Some time, emits beep sound in random way. I mean not the usual know (from 1 to 5) but continuosly and disconnecting the USB device connected or external audio plug the beeps stop.
- External USB HD used for "Time machine" back up
- HP printer connection
- Belkin additional USB ports (just for comfortable device connection, but no any device is permanently
- Audio jack plug for external audio system.
Is some one has more suggestion, will be very appreciated.
Thanks in advance.
Do you see the problem with all of that stuff disconnected?
If it works without all of that connected, try connecting one thing at a time and see what happens. If you find that one thing is causing the problem, you might be able to find updated drivers.
I've tryed to disconnect all my external devices...but with no success.
Around some italian Apple forum, I've found a discussion regarding bluethooth keyboard that lets start in "automatic" the Mac in Safe mode during the its boot.
No any exact and definitive suggestion in order to fix this malfunctioning, except to switch on the bluetooth keyboard once finish the OS boot.
I want to try to work using a USB keyboard and see the result.