Camera does not operate when power switched on. WB and access lamp blink even when power is switched off.

The POWER lamp should be green, 100% of the time.
The WIRELESS lamp should blink, as it "pools" many times per second, chatting with (or looking for) wireless devices.
The INTERNET lamp should blink, whenever any wired/wireless device tries to access the Internet.
For each WIRED device, the lamp should be green, 100% of the time, whenever the device is responding (maybe even when the device is "sleeping").

This may be that your memory card has a fault and the camera is trying to write to it.
Can you try another memory card?
Memory cards can develop faults.
A memory card format in the camera may help but this will wipe all your photos.

I cant detect my pics in my laptop from the sd cars. But I can see in my camera when I insert the same sd card. Is there any problem with sd card or any virus effected? How to upgrade the sd card. please help me out.

Connecting the Camera to the PC

Preparation:
Set the camera’s power/mode switch to OFF.







NOTES
• When the USB cable is connected, turning on or off the camera causes malfunctions of the PC.

• Connect the camera directly to the PC, not through the hub.

• Do not use an extension USB cable.

• Saving the wrong kinds of files in a recording medium or deleting files or folders from a recording medium can cause problems with the operation of the camera. When it is necessary to delete a file from a recording medium, delete it through the camera. Also, do not move or rename folders and files in the medium on PC.

• Never disconnect the USB cable while the access/charge lamp on the camera lights or blinks.


1 Create a folder to back up files into.





2 Set the camera’s power/mode switch to STANDBY/ON.



3 On the camera, move the set lever to
\/ / /\ to select [PLAYBACK ON PC],
then press down.

4 Double-click [EVERIO_HDD] or [EVERIO_SD].



5 Select the folder that you want to back up, and drag & drop it into the folder you created in step 1.
• SD_VIDEO:
Folder that contains video files. If you want to back up fi les individually, open this folder, and drag & drop folders such as [PRG001] one by one.
• DCIM:
Folder that contains still image fi les. If you want to back up fi les individually, open this folder, and drag & drop files such as [PIC_0001.JPG] one by one.




When you have finished operation

Always follow the procedures below when disconnecting the camera, or turning off the camera/computer power.
Failing to do so may cause damage to the camera and computer.

1) Confirm that the access/charge lamp on the camera does not light or blink. (If the access/charge lamp lights or blinks, wait until it is turned off before proceeding.)

2) Double-click the [Safely Remove Hardware] or [Unplug or Eject Hardware] icon in the status bar.

3) Select [USB Mass Storage Device] or
[USB Disk], and then click [Stop].

4) Click [OK].

5) Disconnect the USB cable.

6) Turn off the camera and PC.

The link below might be of help:
http://www.fixya.com/support/r5100611-canon_d_slr_error_99

It's a deadly common problem of D90. Fixation:Simply go to the DSLR repair shop and ask them to change the power circuit board of the camera. Will take $60-70 if the board available. Reason of issue:The power control IC get short and feedback the battery power to the battery causing the draining out and other problem like the top LCD back lamp turned ON after turning on the camera. Careful:To avoid this issue in future, after full charge of the battery, do not put it in the camera right then. Wait for the battery to cool down for 5-10 min and then put it in. With the full charge, the battery hold high ampere for a short time. It could damage the power distributor IC suddenly if you put it in the camera right after a full charge. Best, Leo>>from personal experience<<

the battery is not in good condition.you need to charge the battery adequeately and also check the green ligt in the charger when you plug in.

white balance... you can go through the white balance menu and change the custom to whatever temperature you want... camera 1, wb, cwb, right to change temp. you can also change the red and green on the presets by pressing right at each preset temperature.

now if you are using one touch wb, then put the wb on one touch, then in camera ready hold in the one touch button and press the shutter button while pointing to white or gray card. this is stored as one touch until one touch is done again or the camera is reset. turning off camera will not reset the custom wb.

so to access your stored one touch put wb on one touch because this stores that last white balance done

In cases where the blinking low-battery icon appears indicating insufficient power, wait approximately 8 seconds until the LCD monitor display and the EVF become blank. Then switch to another power source or replace with fresh batteries.

It's in the manual for sure. There are a couple of preset WB settings in the camera. You can access these by pressing the WB button on the lens, it will change the WB setting from one to another for every press. You can also do custom WB with one push botton.