Method 3. How to force system to boot back to XMB if everything else fails
Last resort to booting back to XMB is done by pressing and holding power button for about 5 seconds and system will force power off (or by powering off via main power switch back, but this should be avoided). Now when PS3 is completely shutdown power it same way by pressing and holding powerbutton for about same 5 seconds, until you hear two beeps. Let go of power button and system will boot back to XMB and resets your display settings. This doesn't remove installed XMB apps, pictures etc.
http://psubuntu.com/forums/viewtopic.php?t=32&f=4
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Method 3. How to force system to boot back to XMB if everything else fails
Last resort to booting back to XMB is done by pressing and holding power button for about 5 seconds and system will force power off (or by powering off via main power switch back, but this should be avoided). Now when PS3 is completely shutdown power it same way by pressing and holding powerbutton for about same 5 seconds, until you hear two beeps. Let go of power button and system will boot back to XMB and resets your display settings. This doesn't remove installed XMB apps, pictures etc.
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