I'm sure I have been on this screen before as well, I think I held the power button down until first beep when powering the console back on to get out of this mode.
That's EXACTLY what you need to do Rautz - hold down the Power Button until you have heard two beeps in total - one for pressing the button and another one for holding down the Power Button after a few seconds.
Yeah i read something about holding it down for 5 seconds, but since this screen mainly just had network connections i figured i could reconnect via Target Manager and change the boot mode, so yeah what i did works as well.
PS3 Slim w/ Rebug Rex 4.30.2, 500GB Internal, 1TB/3TB External; PS2 Fat McBoot w/ Hard Drive; Windows 7 x64 Ultimate
Last game finished: The Last of Us | Currently Playing: Metro Last Light
What's really scary for me on DEX is playing a graphic rich game (Uncharted 3) for a while.
Then going into multiman and seeing the temp on the RSX at 83 in red. I have a three year old
Slim (CECH2501a, Originally 160GB, 3.40 downgrade-able) that I keep pretty clean and well ventilated.
I know on DevWiki it says DEX converts heat up the RSX more but damn!