Laptop Doesn't shows the bios manu, Only shows black screen with blinking cursor?

I had Lenovo laptop with Windows 7 OS.
I want to install "Kali Linux" by removing windows 7.
So, I made bootable pen drive of Kali Linux.
Then I installed it.
Installation was successful,
but while installation, It shows some message about GRUB but I didn't know any thing about it.
So I underestimated it, and That was, I have to choos where to install GRUB boot loader.
So at first I install it in internal hard drive, and I restarted computer but, it again asked for re-installation.
So I re-install the Kali linux and in second time I choose the option to install in pen drive.
Then after restarting again they asked to re-install, so I had removed pen drive and I neviget to bios or boot menu, and I disabled the usb boot.
And then, When I restart the laptop, It was showing lenovo logo, and black screen with blinking cursor, and nothing else,
I tried to open bios menu, but no function key worked, f1-f12, and DEL key and Holding Shift key, etc, I tried much to nevigate into boot menu, but I didn't succeed, and also,
I made bootable dvd of linux mint, but It also doesn't work in my laptop.
Now what to do, Please Help me, I'm stuck since 4 days…
.
Any answer, wrong or write, will be highly appreciated.

Yes, you should blink your eyes again to get sorta of ****, so anyway burn your laptop down.

You have to format and reinstall. GRUB errors come up because of inconsistency in memory partition. The O.S can't boot because of the lack of memory.

Well, you were pretty dumb to uninstall Windows 7. You should have done a dual-boot.

You have to look up your laptop model and get into the BIOS. If you can't get into the BIOS then you are f@cked.

Your only hope is that it did not erase the recovery partition and your Lenovo came with a NOVO button.

Make sure you back up all your files before doing this.

If your resetting a lappy, make sure you have the AC adapter plugged up. You do not want this process interrupted. This should take one or two hours. It is best to check on it to make sure everything is going fine.

Windows 7 system with a BIOS

With the system off press the NOVO button and it should start up and display the NOVO menu.
Use the arrow down and Select recovery. Press the enter key and you should see this screen.

https://support.lenovo.com/...ashx?la=en

Select recovery and then which recovery you want. Then click next and away you go.

You can also access the BIOS setup if you have the NOVO buttom

Remove the Pen /CD or Hard drive.therefore no operating system. Now it will diasplay the error and you will able to access BIOS by press key with FN key or without FN key

BIOS Utility is entered by holding F2 while the ThinkPad logo is displayed after power on. Enter setup by pressing CTRL+Alt+F11 from a DOS prompt (you must be in DOS mode, not a DOS session under Windows). With the unit powered off, hold the F1 key and power the unit on. Keep F1 held down until Easy setup appears.