27 inch iMac (April 2011) - Two external displays - how?

I've just got a new 27" iMac and have connected two external displays via the mini display port. I can only get one to work, what am I doing wrong?

Sorry that was a dumb typo on my behalf. Here is the setup:
Apple 27inch iMac only bought today, so it's the newest version with the two Thunderbolt ports.
Two seperate external monitors each connected to a seperate port via a DVI cable and Mini DisplayPort to DVI adapter.
So that's:
iMac x 1.
Thunderbolt port x 2.
External Monitor x 2.
Mini DisplayPort Adapter x 2.
3 displays in total. But when I turn on both displays only one will show up.

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0E7247ABF86E
Wed Aug 27 13:47:26 2014
Machine-check capabilities: 0x0000000000000c09
family: 6 model: 42 stepping: 7 microcode: 40
signature: 0x206a7
Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz
9 error-reporting banks
Processor 0: IA32_MCG_STATUS: 0x0000000000000004
IA32_MC3_STATUS(0x40d): 0xbe00000000800400
IA32_MC3_ADDR(0x40e):   0x00003f7f81890b5f
IA32_MC3_MISC(0x40f):   0x000000000003ffff
Processor 1: IA32_MCG_STATUS: 0x0000000000000005
IA32_MC3_STATUS(0x40d): 0xbe00000000800400
IA32_MC3_ADDR(0x40e):   0x00003f7f81890b5f
IA32_MC3_MISC(0x40f):   0x000000000003ffff
Processor 2: IA32_MCG_STATUS: 0x0000000000000005
IA32_MC3_STATUS(0x40d): 0xbe00000000800400
IA32_MC3_ADDR(0x40e):   0x00003f7f82b44482
IA32_MC3_MISC(0x40f):   0x000000000003ffff
Processor 3: IA32_MCG_STATUS: 0x0000000000000004
IA32_MC3_STATUS(0x40d): 0xbe00000000800400
IA32_MC3_ADDR(0x40e):   0x00003f7f82b44482
IA32_MC3_MISC(0x40f):   0x000000000003ffff
panic(cpu 1 caller 0xffffff8000cdcad9): "Machine Check at 0x00007fff8c94b14a, registers:\n" "CR0: 0x0000000080010033, CR2: 0x00000001084a1000, CR3: 0x0000000045bac03a, CR4: 0x00000000000606e0\n" "RAX: 0x0000000000000000, RBX: 0x00007f993c100000, RCX: 0x00000000000002e5, RDX: 0x0000000000000008\n" "RSP: 0x00007fff5a355610, RBP: 0x00007fff5a355620, RSI: 0x00007f993c12e480, RDI: 0x000000010589f000\n" "R8: 0x00007f993c100000, R9: 0x00000000000002e4, R10: 0x0000000000001955, R11: 0x0000000000000000\n" "R12: 0x00007f993c12e480, R13: 0x000000010589f000, R14: 0x0000000000000000, R15: 0x00000000000275b4\n" "RFL: 0x0000000000000206, RIP: 0x00007fff8c94b14a, CS: 0x000000000000002b, SS: 0x0000000000000023\n" "Error code: 0x0000000000000000\n"@/SourceCache/xnu/xnu-2422.110.17/osfmk/i386/trap_native.c :168
Backtrace (CPU 1), Frame : Return Address
0xffffff81edc13dd0 : 0xffffff8000c22f79
0xffffff81edc13e50 : 0xffffff8000cdcad9
0xffffff81edc13fb0 : 0xffffff8000cf3fef
BSD process name corresponding to current thread: WindowServer
Mac OS version:
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Kernel version:
Darwin Kernel Version 13.3.0: Tue Jun 3 21:27:35 PDT 2014; root:xnu-2422.110.17~1/RELEASE_X86_64
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Kernel text base: 0xffffff8000c00000
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Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1333 MHz, 0x0198, 0x393955353432382D3034322E413030472020
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Bluetooth: Version 4.2.6f1 14216, 3 services, 15 devices, 1 incoming serial ports
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FireWire Device: My Book 111D, WD, Up to 800 Mb/sec
Thunderbolt Bus: iMac, Apple Inc., 22.1

IMac G5 iSight detects external display when none is connected

Hi,
I purchased an old 17" iMac G5 iSight,in which the screen sometimes suddenly turns to blue and the resolution drops as it detects a VGA display even though no external display is connected. It even shown two displays in the preference panel.
I opened the iMac and checked the capacitors which look okay. I reinstalled the OS and it didn't fix the problem.
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I found this discussion from another forum: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/172427
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The MacBook literature says that only a second monitor is supported but I was hoping there is a way to override the MacBook screen in a two monitor setup and port the display to the third monitor.
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I Have a macbook pro 13" 2013 It has i firewire and one mini display port. How can I (or what do I need) to connect two external monitors, to function as independent screens thanks

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