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have you replace the Transfer belt.??? It also has a transfer roller for yellow. (Called First Transfer) since it is transferring yellow off the drum. You have replaced the yellow image unit???? 2nd transfer is to the paper!!!
Sounds like it is either the power supply or the board.
Try disconnecting the power supply (unplug the printer) for about 5 minutes. Reconnect and turn it on. If this works it will probably not be a long term fix. Sounds like your in for a new printer or power supply for it soon. Did you have a electric outage recently? Or power surge?
Replace the drum. The drum is failing. When you replace the drum open the front door of the machine where thr drum and toner is. Hit the clear/back button. Press 1 That resets the drum count after you replaced the unit.
I had the same problem after a resent power outage. Here's what fixed mine.
Turn the power switch off. Wait a 15-20 seconds While holding the button on the front panel down turn the power switch on. After the drum light comes on release the button wait then press the button again. Turn the machine off then back on again and you should be back in business.
To prevent the problem in the future if you are not using the printer turn it off and if the power goes off while printing get the printer turned off before the power comes back.
Definitely the fuser got problem. This can be confirm by pressing the Go button and only the Toner LED will light up.
What had happen was right after the power blackout the fuser has fused together both rollers (heating drum and rubber roller) where the paper pass through in between the rollers. Since there was a power blackout, the printer fan has stop functioning and the heat was unable to disperse out from the printer. Suggest to improve on design to disperse heat using aluminium cage in case of power blackout.
Who ever has a Brother HL-2040 should definitely use together with a UPS.