SD Card issue

The official oprating systems of the HX4700, WM2003 and WM5, do not support SDHC card format. Since most 4Gb "SD" cards are in SDHC format (check the label on your card), the file format of your card is likely to be incompatible with the PDA. Get a 2Gb SD card, or go for a Compactflash card for 4Gb to 32Gb of storage space.

open the device and check the componets are not shorting out, when you droped it, with that much force you may of bent the leads inside or broken, if it bent you can fix it but you broke it than it is time to buy a new one, check the power source for that switch make sure it is okay.
you may of knocked something out of alinement.

rodgandysr567

Your slot in the iPAQ is a SD slot, not a SDHC slot - therefore it will not read the card. Your PC card is probably a dual reader. The SD cards look the same but are different. Have a read of this...
http://en.wikipedia.org/wiki/Secure_Digital_card

Not sure about the memory card way, active sync didn't work on mine either and from what I read it won't but my machine automatically sync'd on starting the sp29841 application file I downloaded from the HP site (the sync can take a while). Active sync didn't start to work again until it was restored through that (up to that the PC didn't recognise the ipaq as connected either). Hope you get it sorted.
Stevie

Make sure your card is NOT an SDHC. the HX470x only reads standard SD cards. The largest that I have found is 4GB SD (not SDHC)

How to correct iPAQ 5450, 5455, 5550, 5555 battery charging problems / dead unit syndrome.

The iPAQ 54xx or 55xx will not power on if the batteries charge is lower than 3.2 Volts, if your battery charge falls below the 3.2 volts level your unit will not turn on, you need to plug the iPAQ into a cradle or AC charge adaptor. Note the charging light on the iPAQ will not flash at all (normally flashes orange) until the battery charge has reached a minimum charge level of 3.2 volts. You then need to perform a normal reset, then the unit should switch on normally.

HP Procedure is as follows:

To charge and reset the iPAQ Pocket PC h5400:

i) Connect the iPAQ Pocket PC h5400 to an A/C power supply.
ii) Charge the battery to the minimum level of 3.2 Volts. This will take 5 to 30 minutes depending on the current charge level.
iii) Perform a normal reset.
iv) Power on the iPAQ Pocket PC h5400

It is recommended that you keep the iPAQ Pocket PC connected to the Universal Cradle or Cable when it is not in use.

I had the same issue. Got it fixed at PPCTechs at $60 + shipping. Better than buying a new device http://www.pocketpctechs.com/main~unit~HP_Compaq_iPAQ_hx4700-265~area~repairs~item~PPCDIAG~name~HP%2FCompaq+iPAQ+hx4700+Pocket+PC+Diagnostic+Service.htm

Doosoft's mobsync is brilliant. I have used it for a year now to back up my SD card. It starts automatically when doccked. Also allows me to specify folders to back up on different schedules. http://doosoft.seesaa.net/

If an ipaq loses power , then all data in RAM is lost. It's important to keep it charged. It's also important to do regular backups..... so there are two backup options - one is thru Activesync which will backup to your PC and one is the IPAQ's own backup program which will backup to the IPAQ FILE STORE (area in ROM) or a SD card. I do the Activesync backup every time I sync and then the IPAQ backup about once a week or immediately before a system change. Activesync backup ------------------------ Here is a guide which best explains it http://www.cewindows.net/faqs/activesync/backup.htm this guide suggests doing a full backup, but it's fine to do an incremental backup each sync - this means that only changes will be added to your backup and makes the whole process much quicker. IPAQ Backup ----------------- So under Programs is a program called IPAQ Backup. The default location is IPAQ FILE STORE which is an area in ROM and is not lost thru a power failure nor hard reset. You may also choos to backup to a SD card - a full backup will need roughly 20MB. So in this backup procedure, if you click on 'Browse' you can choose a SD card. A restore can then be performed from the IPAQ FILE STORE or SD card (depending on which location you chose) and so if you are away from your PC, this will be no problem. A restore this way , rather than thru Activesync is also much quicker, so if you have a choice go this route.