Long read ahead Naveen.
Check to see if the problem is the;
A) Graphics chipset,
B) Video Cable,http://www.ebay.com/itm/Compaq-Presario-1700-Laptop-LCD-Ribbon-Cable-251352-001-/310601465049?pt=LH_DefaultDomain_0&hash=item48514a3cd9
C) Screen Inverter,http://www.ebay.com/itm/Compaq-Presario-1700-LCD-Inverter-KUBNKM011A-/280971500392?pt=US_Laptop_Screens_LCD_Panels&hash=item416b34db68
(Not advertising, but on another note; you can buy the whole laptop for $50 USD,http://www.ebay.com/itm/Compaq-Presario-1700-14-1-Laptop-Pentium-lll-1GHz-256MB-CD-RW-DVD-Rom-20GB-HDD-/390534574226?pt=Laptops_Nov05&hash=item5aedacb092
A) Graphics chipset:
Laptop OFF, monitor OFF, connect a VGA monitor to the VGA port on the back of the laptop.
This is an example of a VGA connector (port), and VGA cable,http://en.wikipedia.org/wiki/VGA_Connector
Scroll down a little for VGA cable example.
You can use a CRT type monitor (Looks like a small TV), or a flat LCD screen monitor of it has a VGA cable.
Turn the monitor on. If a CRT type allow it to warm up.
Turn the laptop on.
By factory default settings, the display should show on the external VGA monitor.
There are at least 3 display options;
1) Internal monitor of laptop ONLY
2) Internal monitor of laptop AND external VGA monitor
3) External VGA monitor ONLY
Press, and hold the Fn key down, and at the same time tap once on the F3 key. The F3 key is the Display Toggle-Over key.
Hold the Fn key down again, tap once more on the F3 key.
A good display on the external VGA monitor means the graphics chipset is OK.
A white screen on the external VGA monitor, means a problem with the graphics chipset. More than likely the Mounting to motherboard, of the graphics chipset. (BGA surface mount)
If this is the problem post back in a Comment.
A good display on the external VGA monitor, means the problem is the Video Cable; or inside the Display Assembly.
(Screen Inverter or LCD screen)
B) Video Cable:
The Video Cable plugs into the motherboard, in an area under the LED Button Bezel, and right next to the Left HINGE.
[LED Button Bezel is the strip of plastic below the LCD screen, and above the Keyboard. Has LED indicator lights in it, etc ]
It then leads up into the Display Assembly, where a small separate cable connects to one side of the screen Inverter, and the rest of the cable connects to the Back of the LCD screen.
Just due to normal repeated opening, and closing of the laptop; the Video Cable may become pinched.
This allows it to be pulled on, and/or damaged.
ALL power removed, AC adapter (Charger), and Battery; the connections for the Video Cable should be checked.
Motherboard side, screen Inverter connection, and LCD screen side.
Motherboard side connection:
1) Remove the LED Button Bezel.
Two screws (Philips) are removed from the bottom of the laptop, and the LED Button Bezel is CAREFULLY pried up, and off.
Details are in Page 91 in the Service Manual, which I will include at the last of this solution.
I will refer to the page number from now on, for the specific component removal.
2) Remove the Keyboard. Page 93.
I state remove, but do NOT unplug the Keyboard Cable from motherboard connector. Just unfasten the Keyboard, roll LCD screen side towards you, and lay upside down on the Palm Rest Cover.
You MUST physically check the connection for tightness. Try to plug it in tighter.
LCD screen side connection:
Disassembly of the Display Assembly, is not shown in the Service Manual. (At least I couldn't find it)
REMOVAL of Display Assembly is.
So I will guide you step by step. I do not believe the Display Assembly has to be removed, in order to remove the Display Bezel.
The plastic frame in front of the LCD screen is the Display Bezel.
Looks like this removed,http://www.ebay.com/itm/COMPAQ-PRESARIO-1700-14-1-LCD-FRONT-COVER-BEZEL-/320720203233?pt=US_Laptop_Screens_LCD_Panels&hash=item4aac69ede1
From what I can see, there are four Philips head screws to remove, from the Display Bezel.
There is a Screw Cover at the Top Left, and Top Right to remove.
The is a Screw Cover at the Bottom Left, and Bottom Right to remove also.
The Screw Covers are made of synthetic rubber, or plastic.
I use a computer pick, and lift up at the base of the Screw Cover, where it meets the Display Bezel.
The Screw Covers are held in place by a type of rubber cement.
If you are careful you may be able to reuse them. If they don't stick again, apply a TINY dab of rubber cement with a toothpick.
I LIGHTLY stick them to the Display Bezel for safekeeping.
Remove the 4 Philips head screws. (No.1 Philips screwdriver, or No.1 Jewelers Philips screwdriver)
The Display Bezel has TABS going around the exterior perimeter, of the inside edges.
The Display Cover has matching LATCHES that the Tabs snap into.
I suggest cut a piece of thick construction paper, to JUST FIT the inside edges of the Display Bezel, and lay on LCD screen.
(Display Assembly laid as far back as possible)
This will protect the LCD screen from your fingernails.
The bezel is flexible. Come to the inside edge (LCD screen side), of the right side of the Display Bezel.
Lift the edge up with a fingernail, until you can slide a fingertip underneath.
Can't get in? Move over. You are at a Tab/Latch.
Bezel lifted up with one fingertip slid under, move over with the other hand, and slide a fingertip under. Flex the bezel up a little, and move towards the Top.
By now you should hear a Tab/Latch snap loose.
Sounds like you are breaking something.
(Do use CARE! The bezel can be broken, but not if you are gentle, and go slow)
Keep popping the Tabs/Latches loose, going around the Top, then Left side. By the time you come around the Left side, the entire Display Bezel should pop loose.
(At the TOP. You may have to slide the Latch over to the open side, to get the slot in the Display Bezel to clear, if a Latch is used)
Not your laptop, and uses more screws. Just a basic 'hands-on' guide I thought may help,http://www.insidemylaptop.com/how-to-replace-screen-on-asus-u56e-laptop/
More to follow in added Comment.
Free Service Manual,http://h10025.www1.hp.com/ewfrf-JAVA/Doc/pdf/c00000630.pdfhttp://www.overclockers.com/more-laptop-musings/