My D2500HN board simply will not see any USB boot devices. USB flash drive nor external DVD. Turned stuff on in the BIOS, updated/degraded the BIOS version, still nothing.
Has this board worked in the past? If so, what changed?
If, on reset or power on, you press F10, what is (and isn't) included in the list of available boot devices?
Try accessing the BIOS and press F9 to set the BIOS to defaults settings and then press F10 to save any changes.
If the problem persist I would recommend submitting a warranty request for the unit if it is still under the three years warranty, you can submit your request here: