Dell 710M display has vertical colored lines instead of info

check every flat cable main boerd to t-con t-con to display if dont help display is a problem

Sounds like you have a section of dead pixels. This can happen if the laptop has been dropped a lot or stepped on or some type of impact on the laptop. This is a hardware issue. You will need to have the screen replaced. In my opinion, by the age of the laptop, its better off getting a new one.

You can try to update your video driver from dell at "support.dell.com".
You will need to enter the service tag number of your laptop and follow the instructions to download the driver.

the hard drive crashed and only reads some of the progams so it is time to replace the hard drive

Yes! but it is a good idea to hook a spare monitor to the video output first to make sure there is no problem, if okay! replace the LCD screen. Go to www.ebay.com Type: make and model of the laptop and refine search to screen, a list of sellers will pop up showing the prices.

Could be 2 possible culprits.
1) Your LCD display panel is defective.
2) You video I/O cable that connects the LCD to motherboard is defective or has poor connection.

Try taking out the Ram memory first one stick at a time. Sometimes when Ram goes bad or overheats, it first affects the display. If that is not the issue, here is the link to your service manual.

http://support.dell.com/support/edocs/systems/ins9300/sm/index.htm

Vertical lines on half the screen:
Usually the display ribbon cable or the LCD display. At the shop we find out replacing ribbon cable first.
In some rare occasion it can be the display adapter built on the motherboard. You can test the video adapter connecting the laptop to an external display.
regards.

Had the same problem. Fixed it though. Here's how:
You'll notice that the screen comes back to life if you press down on the very top of the green line. This is because a controller circuit board behind the LCD screen (at the top) is pressure fit flat-surface-to-flat surface to the contacts on the back of the LCD. Eventually, the sticky substance that holds this circuit board in place wears thin, collects dust, etc.. and the connection between the circuit board and the lcd contact is lost. The line appears where this break in contact has occured. 
So, the solution is to increase the pressure at that point to reestablish the connection. I wasn't able to remove the circuit board to clean beneath it as it seemed too likely to cause damage. Nor would I have had the right adhesive to connect it back, so I simply removed the LCD and put a bunch of tape at that point so that it would "push" with a little more pressure when screwed back into place. Worked great.
To remove the LCD, pull off the 6 feet around the screen. Remove the screws behind them. Carefully pry off bezel with a small flathead screwdriver working your way around it. Once removed there are simply 4 screws on the left and 4 more on the right of the LCD to remove. Pull out screen carefully and start stacking bits of tape on the spot where pressure seems to work best. Put it back in and see if you've made any difference. I did this with the computer on so I could verify my results. Just be careful not to short out any naked contacts.
If this doesn't work for you, at least you'll know you just need to replace the LCD, not the video card. Easily found on ebay.