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If you find the manual look for the &quot;clear cmos jumper setting&quot; or take the battery out as rindi suggested.
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If you find the manual look for the "clear cmos jumper setting" or take the battery out as rindi suggested.

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Right, here we go :(<br />
My main PC, an OEM model has been working fine for a 3 years or so. It has an MSI MoBo with 2Gig RAM., I think it has a 3Ghz Intel Processor. After rebuilding another machine over the weekend, for some reason that escapes me at the moment, I decided to have a look at the BIOS settings of my main system. I set the BIOS to 'HIGH Performance Settings', ignoring the 'well it may not work after this' warnings, thinking that I could just change the setting if it didn't work. <br />
Well, it didn't work :( The trouble I get no graphics at all from it so I can't get back into the BIOS to update it. I've tried two differeent AGP graphics card and and old PCI one without success. I MAY be able to dig out the manuals etc, so that give a more accurate description of the system but any ideas of how I can reset the BIOS would be more than welcome !! The system sounds like its booting, but there are no beeps etc it's very hard to tell without a screen !
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Right, here we go :(
My main PC, an OEM model has been working fine for a 3 years or so. It has an MSI MoBo with 2Gig RAM., I think it has a 3Ghz Intel Processor. After rebuilding another machine over the weekend, for some reason that escapes me at the moment, I decided to have a look at the BIOS settings of my main system. I set the BIOS to 'HIGH Performance Settings', ignoring the 'well it may not work after this' warnings, thinking that I could just change the setting if it didn't work. 
Well, it didn't work :( The trouble I get no graphics at all from it so I can't get back into the BIOS to update it. I've tried two differeent AGP graphics card and and old PCI one without success. I MAY be able to dig out the manuals etc, so that give a more accurate description of the system but any ideas of how I can reset the BIOS would be more than welcome !! The system sounds like its booting, but there are no beeps etc it's very hard to tell without a screen !

No DISPLAY after changing BIOS settings

A personal computer is a general-purpose computer whose size, capabilities and price make it useful for individuals, and is intended to be operated directly by an end-user with no intervening computer time-sharing models that allowed systems to be used by many people, usually at the same time. Personal computers may be connected to a local area network (LAN), either by a cable or a wireless connection, and through that to the Internet. A personal computer may be a laptop computer or a desktop computer running an operating system such as Windows, Linux or Macintosh OS.