Why did Tsarist system survive the 1905 revolution in Russia but not the one in March 1917?

Czarist Russia had had many problems. The Czar was strictly autocratic and yielded absolute power; but his government was inefficient and corrupt. Though we had 'Tsar Liberator' Alexander III, reforms were nil, unsuccessful and reversed by succeeding Czars. At a time where other western European powers were advancing in science, Russia was left behind in its firm, age-old traditions. There was widespread discontent among all the classes of Russian society and Lenin, the founding father …

…and during both the revolutions were different, but the causes were the same i.e. discontent and fear of oppression. The Czar survived the 1905 revolution because it was not very well organised and the Czar, or rather his soldiers, responded quickly. In 1917, the Czar did not respond quickly, he was out at the front, something unnecessary and uncalled for in Russian society, and did not stand up for his autocratic rule when he needed to.