I had problem of getting hang up ("shutting down" display remain frozen on screen & no power shut down) with my z570 window pro 64Bit installed. It was infact not gating wakeup after we put machine in sleep mode.
I downloaded & updated machine for latest BIOS (for Z570) from lenovo site. As stated by them in readme file (specific to this BIOS), this BIOS is suppose to care of similar hang up win 7 problem. After BIOS updatee I did clean (by deleting all partitions etc) installtion of win-7-pro-64Bit.
Now this hag up problem is solved ....... BUT ....... Not able to connect via Wireless connection now (which was working earlier). This wirless connection problem I found with several others in this form.
In order to connect through wireless, you have to press F12 & select boot from CD.
