As extra troubleshooting, I'd recommend the following, just to be 100% sure:
Reboot the system into BIOS by pressing <F2> during the boot process. Once in the BIOS setup utility, press <F9> to restore BIOS default settings. Reset any customized BIOS settings. Clear all DMI event logs by setting the option to "Enable", which is located in the Advanced/Event Log Configuration section of the BIOS Setup utility. Press <F10> to save the new settings and reboot the system.
If the problem continues, test with another power supply. "The minimum recommended power supply is 300 W." (qtd. on page 52 of the Technical Product Specification). Please, refer to the following URL for further power supply requirements: