Basically there aren't any options.
All you can do is to go to the mobo manufacturer's homesite, check for BIOS updates and see if they mentioned a fix of your problem. There were quite a lot of fixes regarding hibernation and powerhandling at the time of the release of WinXP, chanses are that they made a BIOS update for your mobo.
The floppy is no problem, you need a bootfloppy loading the computer into pure DOS. A bootfloppy for nearly any DOS-version will do and you can download it or borrow it.
Options? Buy a new BIOS? Well, it can be done. Now BIOS chips are made for every single version of mobo and you are not likely to find a BIOS for your mobo. Also, the price of them (incl mounting and soldering) don't make them an option really.
If it is a no-name mobo you can probably find the manufacturer by the code in the down left corner during bootup.
But buying a new BIOS... I think it's easier to live without stand-by, go get some beer for the money instead.
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unicorn
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