Lenovo z570 buzzing

Could be many issues, you need to give more information. Mine lenovo does the same thing when it boots. You might just need to wait for a little longer for the desktop top come up.

Other than that, you might need to reinstall Windows.

Measure the voltage at the AC Adapter plug, and see if it is within 5-10% of the rated voltage. If the voltage is not correct, then the battery will most likely not be charging, and the system will drain the battery and die in the middle of what it was doing...booting in your case.

You can tell how much voltage is remaining in your battery and if it is charging by checking the blinking of the battery status light.
Download the Hardware Maintenance Manual here:
http://download.lenovo.com/UserFiles/UserGuide/en/User%27s%20guides%20and%20manuals/Z370&Z470&Z570/Lenovo%20Z370Z470Z570%20Hardware%20Maintenance%20Manual%20V1.0.pdf
and go to page 30 and look at item 7 under battery status for blinking light meaning.
1. Blinking amber: (500ms off/1s on)
The remaining power of the battery is less than 5% of
its capacity.
2. Blinking amber: (100ms off/3.2s on)
The battery is being charged with the remaining
power between 5% and 20% of its capacity.
3. Amber: The computer is operating on battery power with the
remaining power between 5% and 20% of its
capacity

With the AC Adapter plugged in, and giving the correct voltage, If you are getting 1. Blinking Amber (light on for 1 sec, off for 1/2 second), then the battery is not being charged. Could be AC Adapter, Battery or Battery Circuit on motherboard. If the light is solid on 3. Amber, then the battery is not charging, and is draining.

Also make sure the power socket on the laptop is not loose or damaged. If it is, then it will need to be replaced.

I hope this gets you in the right direction.

Sounds like your battery is on its last leg.

One problem that will cause this, and that is easy to check, is to look at the USB ports on the side of the laptop, and make sure they are not damaged or shorted out (with no pins touching each other). This will cause Lenovo laptops to fail the bootup.

Press F8 during boot.

This is a setting in you BIOS. Try changing to AUTO under the SATA drive settings by pressing F key during boot. It will be noted on screen during startup.

I would stay away from a OS upgrade till your are certain all hardware and software is compatible. It is a lot of work if it does not work properly.

1) try to turn on the computer and after the BIOS appear press key f8 and select safe mode.
2) click the icon my computer click the properties and select took, use check now with chkdsk, and fix folders too.
3)run the antivirus+malware+update windows,
4) You can get support from LENOVO via ONLINE get the sofwtare diagnostic, or use the installed in your equipment RUN it. for to see if there are conflict hardware vs software.
God bless you

Computer does not boot up The problem maybe the RAM, it is faulty or just needs reseating to make proper electrical contact.
Reseat the RAM and then boot up your laptop. If it still does not boot up then remove the RAM module/s and take them to your friendly computer repair shop and get them to test the RAM for you.

drivers bad to be replaced or the volume key is stuck