My printer is not working , power cable is connected but no indication of power in the printer. i have already bought a new adapter consulting an electrition

Check eBay for replacement parts. Voltage, power capacity and the connector can all vary but you can probably find a replacement part. If not, the things are so cheap these days.

I knew a consultant who did training. In every city he would buy a new inkjet at the start of his courses. At the end of his courses he would leave the printer in the room as a tip for the hotel staff.

Verify that the power cable is firmly connected into the printer. Plug the printer in to a different outlet, one that you have confirmed works (plug in a lamp to verify that the outlet works). You may plug in the printer without the computer connection to test this. Check to see if the printer has an additional power switch on the back near where the cable attaches. If the problem persists, verify that the voltage is correct with a multimeter. The output voltage should correspond to the DC Output value written on the adapter. Confirm that this voltage matches the DC voltage required by the printer as written on the underside model placard on the printer. If the voltage is incorrect and the adapter is the correct one for the printer, replace the power adapter. If the voltage is correct then there is a problem with the printer that requires repair service. You may want to consider a new printer if this one is not covered by your warranty.

disconnect all the cabled from the printer and leaving behind only the power cable.
Then try turning on the Printer. If it still doesn't turn ON then it means that its a hardware fault. Please consult HP for it. But if in case it does turn ON (the chances of which is very less) then it could be a software issue with the computer. Let me know what happened.

Remove Any Docking Stations or Port Replicators From the Computer Note: Docking stations and port replicators are optional equipment. If you are unsure if you have a docking solution attached to your computer, refer to Table 1 and Table 2 for examples. To remove the docking station or port replicator, perform the following steps: Shut down the computer. Remove the docking station: Universal Docking Stations: Disconnect the docking station's USB cable from the computer. D/Port or D/Dock: Remove any cable locks from the security slot on the right side of the docking station. Move the slide lock forward to the unlocked position. Press the Eject button and lift the computer from the docking station. C/Port II or C/Dock II: Remove any cable locks from the security slot on the left side of the docking station. Pull the locking lever forward until it stops to eject the computer, then slide the computer out of the docking station. Dell manufactures the following docking stations and port replicators (Table 1): D-series DocksC-series DocksSpecialty Docks D/PortLatitude? C/Port IIMedia Bases D/DockLatitude? C/Dock IIInspiron? Advanced Port Replicator Table 1: Dell Docking Stations (Click an image to enlarge it) Universal docking solutions are also available from third-party manufacturers including, but not limited to, the products below (Table 2): TargusKensingtonBelkin Table 2: Universal Docking Solutions (Click an image to enlarge it) Disconnect All Peripherals from the Computer Remove all external connections from the computer. This includes but is not limited to the following devices: docking station or advanced port replicator keyboard mouse speakers or microphone printers scanners USB or 1394 devices palm pilots zip drives secondary battery Plug the AC Power Adapter into the Laptop Computer Remove the battery from the computer. Connect the AC adapter directly to the computer Verify That the AC Power Adapter Has a Solid Green or Blue Light Verify the AC power adapter displays a solid green or blue light. Older Latitude? C Series laptop computer AC adapters may not have a light. The new E series power adapter indicator light is either a blue ring or a blue dot and is located at the tip, on the DC connector, not on the power brick itself (Figure 1). Figure 1: E Series Power Adapter Indicator Light Location Numbers reference image above: E Series Power Adapter Indicator - Blue Ring E Series Power Adapter Indicator - Blue Dot D series power adapters have a green lights located on the power brick (Figure2). Figure 2: D Series Powed Adapter Indicator Light Location Numbers reference image above: D Series Power Adapter Power Brick D Series Power Adapter Power Indicator Light Shut Down the System If the computer currently is turned ON, running on the battery, shut down the system: 1 Click Start. 2 Click Shutdown. 3 Choose Shutdown from the menu. 4 Click OK. 5 Allow the system to power off. Plug the AC Adapter into a Known-Good Wall Outlet Verify the wall outlet is known-good by testing it with another device, such as a lamp. Confirm there are no power strips, surge protectors, or uninterruptible power supplies (UPS devices) connected to the power cable. UPS devices provide temporary power for a computer when there is no electricity available from the wall socket, such as during a power outage. Plug the power cable into the known-good wall outlet. Power up the system. Replace the MiniPCI Door, Rubber Feet, and System Motherboard

you need a null modem adapter hooked up as well.

According of your description, If you already changed the power suply, and the battery, and still no signs to power on, your laptop has some issue at power connector in the motherboard and need to be serviced.

If you already took the printer apart, check the socket where you connect the printer to power, check that the connector soldering joints and contacts are not broke.

The circuit area near the AC adapter socket on the printer is the power board.
If there is a fuse check it.
If there is smell or trace of burnt, that means that a component, usually a capacitor, had blown.

If you do not find anything it must be the AC adapter terminal cable, or the connector , that has a broken contact.

To test it you need to get a multimeter and measure voltage from the AC adapter connector. Alternatively take the printer to a repair shop , tell them that you want to buy a power adapter for your printer, and ask to test a spare power adapter first. Many shops do not charge repair fee for this, as long as it can be done on the fly, and printer must not be left in for repairs.

You can buy the power cord at any computer shop for $3, the printe uses a generic three prongs computer cable:



If instead the whole power adapter is missing , that costs over $30, in that case, better contacting the seller, here is a picture of the adapter:

the first step in diagonising whats the problem will be to tell us whether the power light comes on at all.. if it does come on.. are there any other lights in the fron that are blinking? Please provide this info so that we can proceed further

None of the leds are flashing or indicating the power.
First Possible solution is change power cable or put the one which is already working Cable. If Its not getting power Check the fuse of Printer. If nothing Works Consult to service center as it seems to be under Warranty before doing any manipulation in the circuit.

Regards
Rafique