I am trying to load a cassete into the camcorder and it ejects it, also there's a what appears to be flashing drop on the screen

This appears to be a problem of dirty head. Buy a Hi-8 type head cleaning cassette and clean the head.

Flashing eject sign error appears when camcorder got problem in its mechanism, please put another tape and check.
Remove battery from camcorder for couple of minutes, put battery back and try.
Also observe does tape reels turns reverse and forward when tape loaded in mechanism.
If problem still exist, qualified camera tech will fix it because it is not user level repair.

Per the manual
C means you can fix E means professional service needed.
21 is moisture condensation. icon of rain drop in a box will flash on screen unless moisture in lens Eject tape let sit 1 hour or more to acclimate
31...manual says to eject cassete and reinsert, operate OR daisconnectpower cord andremove battery, reconnect, operate.

From the user manual ...

Under self diagnosis display
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C21:00
Moisture condensation has occurred.
Remove the cassette and leave your camcorder for at least 1 hour to acclimatize. (p117)

On p117
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If your camcorder is brought directly from a cold to a warm place, moisture may condense inside your camcorder, on the surface of the tape, or on the lens. In this condition, the tape may stick to the head drum and be damaged or your camcorder may not operate correctly. If there is moisture inside your camcorder, the beep sounds and the [picture of water drip] indicator flashes. When the [end tape icon] indicator flashes at the same time, the cassette is inserted in your camcorder. If moisture condenses on the lens, the indicator will not appear.

If moisture condensation occurred
None of the functions except cassette ejection will work. Eject the cassette, turn off your camcorder, and leave it for about 1 hour with the cassette compartment open. Your camcorder can be used again if the [water drip] indicator does not appear when the power is turned on again.

Note on moisture condensation
Moisture may condense when you bring your camcorder from a cold place into a warm place (or vice-versa) or when you use your camcorder in a hot place as follows:
- You bring your camcorder from a ski slope into a place warmed up by a heating device.
- You bring your camcorder from an air-conditioned car or room into a hot place outside.
- You use your camcorder after a squall or a shower.
- You use your camcorder in a high temperature and humidity place.

How to prevent moisture condensation
when you bring your camcorder from a cold place into a warm place, put your camcorder in a plastic bag and tightly seal it. Remove the bag when the air temperature inside the plastic bag has reached the surrounding temperature (after about 1 hour).

No still waiting for help

This error means that the heads are not turning. This unit requires service. This is not a homeowner repair.
Dan

uploading problem, when i load my cassete it;s not loading. if i close the cartrige with out cassete it closes but with cassete it won;t close, i already give my camera to jvc service centre the jvc service technician put new cartrige, but i think it;s not alligned properly. And also condensation not comes on the screen

This is a tape transport problem and is expensive to fix. Unless you know a cheap tech, it's time for a new one. Be patient loading and unloading tapes. This is usually what causes this problem. The Yellow warning sticker is REALLY important. Another important item is to always use the same brand of tape because switching tapes causes a gummy build-up the makes tapes get caught in the machine.
Videoteacher

If u look in ur manual it tells u that its a self-diagnosis code!
Step 1: eject the casset and then put it back in record something
step 2:disconnect the power cord of the AC adapror or remove the battery.
step 3: reconect the power or battry and record
step 4: Replace the casset!

thats a breakdown of the manuals instructions

hope this helps
ilewis

Recently repaired one of these with what appeared to be a power supply problem; found several defective capacitors on the drive board. The symptoms were similar to what you are seeing.