hi withness,
as what you said, you are not able to view lenovo logo at start-up, right? if it is, i believe it's hardware issue, possible graphic card, ram or mainboard. you can try to remove/replace/swap the ram sticks to make sure if it's faulty ram.
if it doesn't work, better to contact lenovo support line.
due to my absence, i may not reply your posts and/or personal messages