Toshiba Tecra A8 won't boot

My Toshiba A8 PTA83A-04F012 notebook will not boot. When I boot the machine, I get the normal Toshiba splash screen then the screen goes blanks with a blinking cursor in the upper left hand corner. Apart from the CPU fan kicking in, nothing else happens. I've tried to boot from an alternative devices (eg  CD-ROM) but the same thing happens. I’ve even tried to get into the bios (setup) but it ignores my request. The keyboard seems to function normally. Please help. Tony

Sounds like it could be ram, try it with only one ram strip at a time, also did you install any software recently that could be not working correctly? Does it work in safe mode? Also in the bios see if the computer is reading the hard drive correctly, or maybe you changed a setting in the bios and need to use the default setings Detailed specs if you need them from toshiba http://www.csd.toshiba.com/cgi-bin/tais/support/jsp/modelContent.jsp?ct=SB&os=&category=&moid=160275...
sorry for all the questions, I want your machine to work

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    File Description  :
    Product Name      :
    Company           :
    File Version      :
    Processor         : x64
    Computer Name     :
    Full Path         : C:\Test\032512-15600-01.dmp
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    Major Version     : 15
    Minor Version     : 7601
    ==================================================
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