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Re: error on system start
Your system is failing it's Power on Self Test (known as POST) the beeps are a code which tells you where it is failing.
unfortunately the codes mean different things for different motherboards, however common faults include Graphics card fault (try reseating) and Memory failure.
If you look at the Manaul for the tx300 S2 there is a section on the diagnostic LEDs, I suggest you have a look, as it may help to diagnose your problem (it can identify faulty components)
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In order to change the boot drive you have to change the boot settings in BIOS, or sometimes you can get a separate boot menu which allows you to change this setting on a one-off basis. During the boot sequence you need to press the "F12" button during the POST testing to bring up the boot menu if one is available, otherwise you need to press the "Del" or "F2" button during the POST process to bring up the Bios screens. Navigate to the BOOT option and alter the boot sequence, save the settings, exit BIOS and reboot.
It differs between manufacturer slightly but usually 1 long and 2 short beep codes often means that there is a problem with the video card/graphics card of your computer. This could be bad news for a laptop, as most of them do not have discrete video cards that can be replaced.