Black screen right after switching my laptop on

Hi guys
I have a lenovo G570. Yesterday, I tried turning on my laptop. Win 10 booted, and then hanged right at the login screen. The cursor wasn't moving and it was like that for a few minutes. Eventually I got fed up and pulled out the battery (a big mistake). Then the screen was black after I switched it on again. Lights were glowing, fan moving but nothing on the screen. I kept it like that for a few minutes. Then, I switched it off by holding the power button, removed battery, connected ac adapter and pressed the power button and it got switched on! It started working normally but then restarted suddenly. But this time, instead of booting all the way to the desktop, it stopped at windows logo and then gave me the blue screen of death. Some system file which I don't remember was 'lost' or had 'an error'. The error was 'SYSTEM SERVICE EXCEPTION' I restarted, This time again it loaded to login screen and then restarted. There was 'winload.exe' now instead of the previous file on the blue screen of death. Again restarted and now it won't show anything. Tried like 50 times already. Lights glowing, fan moving but no display. I guess the windows has been corrupted or something. But how do I access bios now to launch installation cd or to usb boot?
Thank you so much.

EDIT: Reseated RAM, HDD. Still nothing. The led on usb drive not glowing when I plug it in but the dvd is making sounds in it. No idea what to do. Please help.

1) Update the system specs in the "My Computer" section:
System Specs - Fill in at Ten Forums:
System Specs - Fill in at Ten Forums Windows 10 Tutorials
In the left corner below in your post you find 'My System Specs'.
After clicking it you can find a link a little below that says 'Update your System Spec', click on this link to get to the page where you can fill in your system specs.
System Info - See Your System Specs - Windows 7 Help Forums


Include PSU. cooler, case, peripherals and anything attached to the computer by wired or wireless (mouse, keyboard, headset, printer, xbox, USB wireless network card, etc.)

2) Open the website for the computer or motherboard manufacturer > enter the product or serial number or model > select the operating system > view drivers and BIOS > post a URL or hyperlink into the thread

3) find a flash drive that you can format ( > or = 8 GB)
4) create a bootable windows 10 iso:
Download Windows 10
5) insert the windows 10 iso into any USB port
6) power on the computer and click the applicable keyboard key:
List of PC brands with their corresponding hot-keys
7) if the computer is a custom desktop change the BIOS boot order to boot to the BIOS boot menu
8) boot to the external USB hard drive
9) It may take 5 - 10 minutes for the iso to load while viewing the Microsoft Windows icon
10) select the language, time, currency, and keyboard or click next
11) click torubleshoot
12) click system restore > start with the oldest date and move to to most recent restore point. If system restore fails or if there are no restore points move to the next step
13) click start up repair > if startup repair fails move to the next step
14) click command prompt > Administrator X:\Windows\system32\cmd.exe > X:\Sources> type:
15) For all of these steps onward use a camera or smart phone camera to take pictures and post images of the commands and the results into the thread
16) c:
17) dir
18) d:
19) dir
20) x:
21) diskpart
22) list disk
23) list volume
24) select disk 0
25) list partition
26) select disk 1
27) list partition
28) exit
29) bcdedit /enum
30) bcdedit | find "osdevice"
31) bootrec /fixmbr
32) bootrec /fixboot
33) bootrec /scanos
34) bootrec /rebuildbcd
35) chkdsk /f /r C:
reboot
Please use a camera or smart phone camera to take pictures and post images into the thread to view the commands and the results.

There's no use of it. I can't even access the BIOS. It's just a black screen after pressing the power button. The LED on my usb drive is not glowing when I connect it.

Run through these post steps and report the results for each into the thread:
What is POST?
Computer POST and beep codes
POST troubleshooting steps

zbook said:

Run through these post steps and report the results for each into the thread:What is POST?Computer POST and beep codesPOST troubleshooting steps

Tried everything till 'Disconnect and reconnect the CPU'. No changes. No beeps or anything. The only sounds are the sound of the fan and sound from somewhere near the hdd. I want to keep disconnecting cpu and other steps as last resorts. Are you sure there's no simpler way out? Maybe the problem is only with the os or bios? Can I do anything else?

For failure to boot some testing methods for ruling in or ruling out are:

1) Using a Ubuntu / Linux bootable flash drive
Create a bootable USB stick on Windows | Ubuntu tutorials

2) Booting with Memtest86+ version 5.01
Memtest86+ - Advanced Memory Diagnostic Tool

3) Using bootable rescue
Windows 10 Recovery Tools - Bootable Rescue Disk - Windows 10 Forums

zbook said:

For failure to boot some testing methods for ruling in or ruling out are:

1) Using a Ubuntu / Linux bootable flash drive
Create a bootable USB stick on Windows | Ubuntu tutorials

2) Booting with Memtest86+ version 5.01
Memtest86+ - Advanced Memory Diagnostic Tool

3) Using bootable rescue
Windows 10 Recovery Tools - Bootable Rescue Disk - Windows 10 Forums

I CANNOT access the bios so obviously I cannot change the boot order. I have a puppy linux usb lying around but it's not even detecting it. It's just a black screen. No bios even.