KPD 0005+5106, with an effective temperature of $\simeq$200,000 K, is one the hottest white dwarfs (WDs). ROSAT unexpectedly detected "hard" ($\sim$1 keV) X-rays from this apparently single WD. We have obtained Chandra observations that confirm spatial coincidence hard X-ray source 0005+5106. also XMM-Newton as well PG 1159$-$035 and WD 0121$-$756, which are whose were by at 3$\sigma$-4$\sigma$...