USB External Hard Drive Removal

When I switch off or unplug a Samsung External HDD on a Windows XP Home PC it automatically reboots. I have verified the settings for the HDD in Device Manager/Policies and it is set for 'Optimise for quick removal' and the cache is unchecked. I have looked at the ASRock mobo BIOS and it is not set to boot from any USB devices. Just HDD and DVDRom drives. It does not happen with memory sticks. The only way is to right-click on the system tray and 'stop' and 'disconnect' that way which is reasonably elaborate. Any ideas?
JVitalAsked:
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Ashok DewanFreelancerCommented:
How much old is your pc ? Power supply could be the cause. if your pc has older power supply.
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JVitalAuthor Commented:
Thank you. That could well be the cause as I have never had this problem on the more up-to-date computers running XP. This is an old E-Machines desktop with a 250W generic power supply. The only way to find out for sure would be to replace the PSU but it is not worth the bother!
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