Nokia 2270 I have an old Nokia 2270 that I love but the screen is going haywire. Sometimes it shows a black line across the middle. Sometimes a cross hatch of lines. Sometimes it works perfectly. Often it goes totally blank. Can I fix it?

Check data cable
cross check display

I love posts that use haywire words...
really.
old Cq61 (310us) is it a 310? for sure, as the service tag shows?
no photo of screens, i can promise you that missing photo
is worth 1000 words !
does it run with them main battery out on line power AC?
it must for as long as you want too.

my guess, besides above test 1 on all laptops
is to
make sure its not overheating. and fan blows, and fan is not packed in lint if the GPU chip overheats it can go nuts. all can,.
we run temp monitor program that lets me see all that.
but im not teaching that now.
this PC has an LED screen so is very good.
but if hit, they break easy, super easy. kids playing thowing things at the screen or dropped PC.

The pC has and external VGA jack to test the PC on any VGA desktop monitor.. (barrow one for a day)

if it runs across the screen its a buffer board usually. Can you paste a picture of the line?

The hard drive has issues, or the window files are corrupt. I suggest a computer repair store to retrieve files and test hardware.

The line is there because the vertical deflection unit - the one that spreads that line across the entire screen to form the image - has failed. Replacing it is a job for a professional, or at least an experienced amateur, and the parts will be quite difficult to find for such an old tv . 

it could be that the tv convergence circuit is going bad. One shure way of finding out is to go to the tv feature menu(picture,audio etc.) and select the customer convergence setting, you should get a cross hair pattern(cross in middle of screen). that cross should be white and by aligning the red or blue colors they should move left, right, up or down

Middle going across the screen from left to right??
This unit is plagued with bad solder connections in the comb filter board and flatpack underneath the comb filter board. These connections can cause any odd number of problems in video display. If it is that it's not expensive - virtually no parts. If it's a single line across the screen could also be the vertical circuit involved.
My suggestion is to have it estimated at a reputable shop and take it to them rather than the more expensive pu/del charges.
If you would like go to http://www.nesda.com/locator/state_search.php and locate a servicer from there. Kinda like going to the AMA to find a doctor...
Hope this helps!
Bill

Is the blue line running straight across the middle of your screen? If so its a vertical deflection problem. Possible bad Vertical output IC

this symptom, sometimes called the tube light effect, it is characterised by a bright thin horizontal line across the middle of the screen. this symptom is caused by a breakdown in the vertical deflection circuit. hence maybe the trouble maybe in the vertical oscillator, amplifier or output circuits. but if all i have said is not clear to you, better bring it to a qualified tv technician. good luck!