Windows 8.1 won't install on partition

Hi,
I have a late 2012 mac mini and trying to install Windows 8.1 through Boot Camp, using a USB drive.
When I get to the point of choosing the partition to install the Windows in, the only formattable partition (the Windows dedicated one) won't let me install.
When I click the details, a message stating that the partition is MBR and windows needs a GPT partition and thus cannot be installed.
However, checking with Disk Utility the disk appears as GPT.
What am I missing here and what's the solution for my problem?
I'm kind of frustrated and need that windows to run some work applications.
Thanks!

I have another external hard disk connected via USB.
Can it be the issue?
I did choose EFI during boot because if I let it run alone and choose "Windows" I only get a DOS looking message that tells me to put a bootable media and press any key, but it doesn't respond to anything, forcing me to hard shut down the computer pressing long time the power button.
The results:
gpt show: /dev/disk0: mediasize=1000204886016; sectorsize=512; blocks=1953525168
gpt show: /dev/disk0: Suspicious MBR at sector 0
gpt show: /dev/disk0: Pri GPT at sector 1
gpt show: /dev/disk0: Sec GPT at sector 1953525167
       start        size index contents
           0           1         MBR
           1           1         Pri GPT header
           2          32         Pri GPT table
          34           6
          40      409600      1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
      409640 1053408448      2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC
1053818088     1269536      3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
1055087624        1016
1055088640   898435072      4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
1953523712        1423
1953525135          32         Sec GPT table
1953525167           1         Sec GPT header
Disk: /dev/disk0 geometry: 121601/255/63 [1953525168 sectors]
Signature: 0xAA55
         Starting       Ending
#: id cyl hd sec - cyl hd sec [     start -       size]
1: EE 1023 254 63 - 1023 254 63 [         1 -     409639] <Unknown ID>
2: AF 1023 254 63 - 1023 254 63 [    409640 - 1053408448] HFS+
3: AB 1023 254 63 - 1023 254 63 [1053818088 -    1269536] Darwin Boot
4: 07 1023 254 63 - 1023 254 63 [1055088640 - 898435072] HPFS/QNX/AUX

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