Frozen screen

Have a look here M200 frozen>

http://kb.sandisk.com/cgi-bin/sandisk_en.cfg/php/enduser/std_alp.php?p_sid=B*7zxOBj&p_lva=&p_li=&p_accessibility=0&p_redirect=&p_brand=sansa&p_page=1&p_cv=&p_pv=1.4&p_prods=4&p_cats=&p_hidden_prods=&prod_lvl1=4&prod_lvl2=0&p_search_text=m250&srch_btn_submit=%C2%A0%C2%A0%C2%A0Search%C2%A0%C2%A0%C2%A0&p_new_search=1

Wait until it runs out of battery than charging it (Power off mode,do not turn it on while charging)