Zoom H2 no card error

SOURCE: Display reads "No Card"

Zoom h4 supports cards up to 2GB. And, I'm almost sure, this is a thing that can't be upgraded through software.

SOURCE: Zoom H2 handy recorder

I presume you have tried new batteries, and/or the problem persists with the AC adapter. If so, have you tried replacing the SD card?

If these do not work then it is probably time for a repair, but I'd ask the Zoom Corp or your dealer first. They may have heard of similar problems and know a painless fix.
www.zoom.co.jp (Japan)

SOURCE: Connect to PC does not work

You need to upgrade the H4  firmware from Zoom website
http://www.zoom.co.jp/english/download/software/h4.php

You will need an external SD card reader.
Good Luck

SOURCE: My Zoom H2 recorder isn't working properly with rechargeables

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SOURCE: zoom h4 Vista recording

Don't know if this is the problem in your case ... but here's what I did:
Note: I have Win XP
Previous to attempting connection between laptop and H4 as an audio interface I updated the H4 firmware to ver2.4 and connected to the laptop successfully as a card reader. From the laptop, I could see files I knew were on the H4 card.
... but when I tried connecting in Audio I/O mode, my laptop didn't know what to make of the H4. There was a USB mass storage driver associated with the H4 - I could see this from the "Device Manager". I "uninstalled" the USB driver associated to that "unknown" USB device. I terminated the audio connection on the H4, then reconnected. !!! It was recognized as "USB Audio Device" in the "Sound, video and game controllers" section of the "Device Manager". Before, it was listed under "Universal Serial Bus controllers" as a generic USB device with a yellow warning highlight indicating there was something wrong.
Hope this helps!