How to format sdhc memory card for kodak z650?

Is it an SD card, 2GB or smaller? The Z650 will not work with higher-capacity SDHC cards.

Use the format command in the setup menu. See this page of the user guide. Make sure you're using an SD or MMC card, 2GB or smaller. This camera will not work with higher-capacity SDHC cards.

Just as I suggested. The Z650 works with SD cards, not SDHC cards. Most likely your old card was 2GB or smaller and your new card is 4GB or larger. Try using a 2GB SD card.
You can clear internal memory by deleting the pictures it contains. Download them to your computer first if you want to preserve them. You can get rid of all of them in one shot by using the "Format" command in the Setup menu.

The Z650 works with MMC and SD cards, not with SDHC cards. While SDHC cards will fit into the slot, they are electronically incompatible and will not work. The M380 will work with SDHC cards, but the Z650 is limited to cards 2GB and smaller.

Just use a 2GB "SD" card,,The Z650 will not accept any of the newer, faster cards available today. Just carry a spare, if you plan on using your camera for lots of pics/videos. Cheer's, Andy.

Having gone over a month without a response, I assume it was a SD/SDHC mismatch.

The Z650 is designed to work with SD cards. Your 8GB card is actually an SDHC (Secure Digital High Capacity) card. While an SDHC card will fit into an SD slot, it will not work properly. You'll have to stay with SD cards 2GB and smaller.

No. The Z650 only takes SD cards, up to 2GB in size. You cannot format an SDHC card in one.

Unfortunately you can't. The Z650 is designed to work with SD cards. Your 4GB card is actually an SDHC card (the HC stands for High Capacity). While SDHC cards will fit into SD devices, they are electronically different and will not work.

SD cards will work in SDHC devices, but that doesn't help you here.

The Z650 uses SD cards. SDHC cards will not work in the camera. You have to stay with SD cards, 2GB and smaller.