My screen is black after powering on. i have

rooted?

This is WORKED FOR ME!--->I turned off my computer than unplugged cable and took out battery, held down power button for 1-2mins and than put everything back in (battery and charger) and tried to start it...the screen was still black. I than turned it off again, than pressed ESC, while holding down ESC I pressed and held power button until it briefly turned on and back off. Than I let go of both the buttons and pressed power back on and VOILA the screen came back on. Make sure your charger isn't loose, and than you're aren't surging too much power through the outlets-sometimes these can make the screen black too.
Hope this helps others out there, I have an old Toshiba Satellite running on Windows Vista

Try this :

1. unplug the ac adapter and remove the battery .
2. press and hold power button for a minute
3. now put the battery back and plug in ac adapter
4. turn on the laptop now

it should work.

if not, try removing hard drive and memory modules then reinstall them back.

if the issue persists, your motherbord has gone bad.

The grey screen is the bios of your laptop is booting, this is freezing for some reason.
Do 3 things.
Try holding power button down for longer at least 10-20 seconds.
do a PRAM reset, apple symbol, alt P & R keys all held on boot up.
Do a smc reset.

1. Shut down the computer.
2. Disconnect the MagSafe power adapter from the computer, if it's connected.
3. Remove the battery.
4. Press and hold the power button for 5 seconds.
5. Release the power button.
6. Reconnect the battery and MagSafe power adapter.
7. Press the power button to turn on the computer.

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Please dont forget to vote this answer was helpful

Many thanks

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might be the lcd what else does it do when you turn it on?

turn off power
hold down 0 & 8 keys
turn power on with keys still held down till beep is heard
enter 252 then press start key
enter 0
press enter icon on display
power off & on
should clear service message

I Doubt Because It's Too Hot. Try Taking Out The Battery. Wait A Day Or Two, Or Whatever You Think Feels Long Enough, Then Put The Battery Back In.

http://oakroadsystems.com/math/ti83oops.htm#Lines

ok guys, after about 10 years of not using my ti-83, i put the new batteries in and got the black screen you are all talking about.. came to this site.. saw no solutions.. kept looking.
I've fixed my calculator, but my brain won't tell me exactly how.. but i followed those instructions..
you CAN see what is on your screen if you tilt it under the light ... just fiddle around until you can see faint writing on your screen under the black.
Press window

i have these entries in my calculator
xmin=-10
xmax=10
xscl=1
ymin=-10
ymax=10
yscl=5
xres=2

then go and press second and the down arrow to lighten your screen. it should work.

Completely remove the battery and unplug the power cord for a few minutes. Reinsert battery and power up. You can also hit F8 when starting and see if you can boot into safe mode.