Flashing error and toner on Dell 1700 and will not print even after replacing drum and toner this happened before and I found on line sequence of pushing the buttons on printer to clear...but i can no

After you replace the imaging drum, you should reset the imaging drum's counter. To
reset the counter, press and hold the Cancel button until all lights flash in sequence.

The photoconductor kit is another word for the drum or imaging drum. All three words refer to the same part.

Here is a link from the Dell site for this model.
http://accessories.us.dell.com/sna/PopupProductDetail.aspx?c=us&l=en&cs=dhs&sku=310-5404

Once you replace the drum, the printer has to be manually reset. If this is not done, the printer will continue to give this print out. By resetting it, the counter is set back to zero. The drum is good for around 30k prints.

From the Online Manual for the 1700, to reset the counter:
http://support.dell.com/support/edocs/systems/1700n/en/index.htm#online_documentation

To reset the counter, press and hold the Cancel button until all lights flash in sequence.

NOTICE: Resetting the imaging drum's counter without replacing the imaging drum may damage your printer and void your warranty.

The printer has no way of knnowing that you have changed the Photoconductor Unit, unless you tell it (as there is not chip on the Photoconductor).

The Photconductor reset procedure is as follows.

Dell 1700
RESETTING DRUM PAGE COUNTER

1) Leave the power on, insert toner cartridge, and leave door open
2) Press the cancel button and hold till the leds flash
3) Release cancel button and close toner cartridge door

Call Dell. the 1700 has special reset instructions for resetting the drum count.

The drum collects used toner for apprx. 30,000 pages. After that, the printer recommends that it be changed to prevent used toner from spilling internally into the printer's mechanisms. The whole photoconducter/drum can be replaced. The new part from Dell is apprx. $50.00 US. 
http://accessories.us.dell.com/sna/products/Printer_Accessories/productdetail.aspx?c=us&l=en&s=dhs&cs=19&sku=310-8710#Overview

You might have reset the "counter" for the photoconducter. Ever  have a water  fillter with an electronic timer? You replace the filter, then you reset the timer? Perhaps you reset the timer without actually replacing the filter. So to speak. :)
The question you should ask yourself is: would I like to spend $30 - $60 [it's cheaper for refurbished parts- Google it] replacing the drum head on a 7 year old printer, or would I rather invest that in a new printer?

Leave the printer on. Open the front and hold down the cancel button until all the lights are flashing in sequence. Close the front while still holding the cancel with the lights flashing and then release the cancel button. This should reset it.

Thanks

After replacing the drum unit you have to tell the printer that you've done it(it's not smart enough to figure it out itself). Have the front door open and press and hold the Cancel button on the printer until all lights flash in sequence then let go. Then close door and try.

hold cancel button down with door open, this should rest it

First unplug power cord and plug back after 10 mins.
If problem persists, then it is probably a toner error, if the toner is nearly finished. In this case you will see the led flashing only when is printing. Sooner or later the printer will start printing blank or faded pages and you will need to change toner
When is not toner, with same symptoms as above, it can be drum error, in this case printer will keep printing but shows flashing light, at a certain point you will need to change drum kit.

If light flashes and printer does not print, then it is either paper jam inside, or one of errors above at final stage, or one of the door not well closed (check them all), or printer faulty (fuser, heads mechanics etc.), in this last case call service.

Ya!!! It was very hepfull. Thanks a lot.