without a decription of any system beeps it sounds like cpu and/or graphics card, if you have an identical system there as you said then try swapping cpu's between and see if the problem follows the cpu to the other system. do the same with graphics.
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Please click the link below for your operating system to download the TSG SysInfo Utility. Click on "Save File" then double-click the file to run it. Copy and paste the report in your initial post. Windows 7 and later (downloads a file named tsginfo.exe) | Windows XP (downloads a file named SysInfo.exe)
