It sounds like it may be the power supply, try using another one, they seem to sometimes play up at first and then work fine, its not really a good sign. but it may be something else, try another PSU.
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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)
