Hello. Since yesterday my Lenovo H50-55 PC does not post or beep. The power light is on but the HDD light turns of right after starting. I get only a picture of LENOVO brand on a secondary screen (my TV) and not even on my monitor. All fans are properly working, dust hast been removed, RAM test hast been done and the beep of motherboard shows that it is intact. I replaced the HDD with another one and the problem was still there. Could anyone help before I contact specialists?