My ipaq 5935 has frozen on the start up HP screen (blue and white) i have tried the reset button and removing the batery for 2 mins, without any joy. Also the battery light wont light up and computer wont recognise its plugged in

A factory reset erases all user-installed settings, programs, and data, and restores your HP iPAQ to factory settings.
CAUTION All user-installed settings, programs, and data are erased from memory with a factory reset.
To perform a factory reset and return your HP iPAQ to factory settings:

1. Press and hold the OK and Rotate Screen buttons.
2. While holding these buttons, use the stylus to lightly press the Reset button on the HP iPAQ until the device restarts.
3. When the HP iPAQ restarts, release all of the buttons, and then remove the stylus from the Reset button.

The HP iPAQ will now restart and power on.

If you have done the above and still no go. Then your main drive has probably failed.

Link below is a repair how to video
http://www.wonderhowto.com/how-to-repair-hp-ipaq-rx4200-rx4240-rx4500-rx4540-243534/view/

Hi,

Did you try to flash the BIOS/firmware of your device?

1.) Go to the Master Index of BIOS, FIRMWARE, & DRIVER Updates,
2.) Select the appropriate hyperlink for your model. (in your case it's here http://mobilitytoday.com/forum/showthread.php?t=4846)
3.) Download the most recent BIOS version SoftPAQ (SP) for your Model of iPAQ.
4.) Press the POWER + iTASK + CONTACTS + RESET buttons at the same time so as to enter the FLASH Mode
5.) Make sure your USB connection to the Cradle is hooked-up.
6.) Place your iPAQ in the USB Cradle.
7.) Stop the MS ActiveSync session on your HOST PC: CTRL-ALT-DELETE > TASK MANAGER > PROCESSES.
8.) Hilight WESCOMM.EXE and select "End Process" button.
9.) Run the file you downloaded from HP in step 3.
10.) The iPAQ should now begin Flashing the iPAQ's ROM BIOS

I had same problem. Finally got mine sorted!!

Try a full reset. Hold the quick launch button and the rotate screen button simultaneously (top and bottom of 4 buttons on left of device) and then use stylis to press in the reset button (on top edge just left of SD card slot). Keep depressed until it resets then release the 2 buttons and then release reset button.

It will appear to do the same but it tells you at the bottom it is doing a reboot or something. After 30 secs or so it then goes past and gets to the screen align screen.

You might loss settings but it worked for me

Hi. I assume that you plugged in your original battery after it was out a while. When your device's battery is drained, all the data in your device may be resetted (changes according to your backup battery's condition). So you should first try to plug it into AC power source for a couple of hours without touching it (Let the battery become usable enough). Then, your device should open without any error, but it may take a while because it will install the Operating System from ROM. In most cases, pluging out your battery won't destroy any internal parts of your device, it may just reset it to factory default settings. If there is an error, here is how you can hard reset your device:
HP iPAQ rx3715 Hard Reset:
1. Hold down the Mobile Media button (on the far left) and the iTask button.
2. Then press down the reset button with the styles for a few seconds until the screen goes dark.

3. To turn on your HP iPAQ after your hard reset, either press the reset button again, or plug it into an AC power source.
Hope this helps. 

I posted a solution for this problem just using your finger to align at first then use the stylus, at any point where target doesn't respond use ur finger.

I got this info from HP website..

1. Press and hold the Quick Launch and Rotate Screen buttons.
2. While holding these buttons, use the stylus to lightly press the Reset button on the HP iPAQ until
the device restarts.
3. When the HP iPAQ restarts, release all of the buttons, and then remove the stylus from the
Reset button.
The HP iPAQ restarts and powers on

It doesn't mention a password. I also have an HP Ipaq and don't need a password to hard reset. Good luck. If this helps you plz rate this. Thank you kindly.

. Press and hold the Quick Launch and Rotate Screen buttons.
2. While holding these buttons, use the stylus to lightly press the Reset button on the HP iPAQ until
the device restarts.
3. When the HP iPAQ restarts, release all of the buttons, and then remove the stylus from the
Reset button.
The HP iPAQ restarts and powers on

Try a Reset....
Performing a Clean Reset will help
A clean reset clears all user-installed settings, programs, and data, and restores
your HP iPAQ to factory settings.
To perform a clean reset and return your HP iPAQ to factory settings:
1.Press and hold the Answer/Send, Power, and End Call buttons.
2.While holding these buttons, use the stylus to lightly press the Reset button on the bottom of the HP iPAQ until the device restarts.
3.When the HP iPAQ restarts, release all of the buttons, and then remove the stylus from the Reset button.
The HP iPAQ restarts and powers on.
Thanks

Hi,
Try This:-
To perform a factory reset and return your HP iPAQ to factory settings:

1. Press and hold the Quick Launch and Rotate Screen buttons.
2. While holding these buttons, use the stylus to lightly press the Reset button on the HP iPAQ until the device restarts.
3. When the HP iPAQ restarts, release all of the buttons, and then remove the stylus from the Reset button. The HP iPAQ restarts and powers on.
Mike @ compurepair.

try leaving battery out overnight.