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On my scanner the pc data cable seems to come loose which makes for intermittent disconnects just like you had. It also does a thing where if you don't use it for even a short period it goes into whats best described as a sleep mode. This almost always requires it be unplugged and plugged back in before it is recognised again. I have a feeling from your description that what you are seeing could be a variation of one of these. The scanner works just fine but it does these annoying things.
As its a scanner there isn't much (almost nothing) we can check or adjust. You can check the data and power cables. Gently give them a wiggle and see if you can get the scanner to nod off again. Usually the problem will be the computer end of the data cable or the scanner power plug or jack. These may be loose or worn and making intermittent contact if moved bumped or vibrated. If you experience more power outages than it seeming to be asleep then the power jack could be loose or the wire inside the power cable may have been damaged. If the wire is damaged you may be able to find where by wiggling the wire. Sometimes you will see a bend where it should be straight. If you don't the problem is usually by the plug end. If you can confirm the problem is the power wire then you can just replace it.
As far as bulb replacement, there shouldn't be any user serviceable parts. The light source inside is a series of leds on the scan bar. These create that light greenish light (most models) as it scans. It should show an error if there is a light problem. You can check by watching the light leakage as it scans. If there is light you are ok, reduced light should just mean darker scan images.
It is possible you have a drive motor issue that is causing excess power use and overheating. If you have used it a lot the guide tracks will wear or get dirty and cause extra friction and the little motor has to work harder and harder until it fails. You could possibly (really doesn't sound like it though) be seeing the early failure of the motor. Unfortunately if there is a serious hardware problem it is almost never worth fixing a scanner. It is much cheaper to replace it. My bet is you are seeing a cable issue.
If the noise is a high pitched whirrrrr, it is the scanner warming up and getting ready for the scan job. If it clunks, or the noise "sounds bad", make sure the "Lock" is not engaged on the bottom of the scanner.
I am sure by now the scanner motor is stuck! Give it a try by powerig on first. There are two types of 25 pin connectors, 1) is serial connector (you will find pins in two rows and 2) Centronics 'D' type where you will find the connectors in the centre. You need to figure it out and use the right cable. You also need scanning software and driver to connect it to the latest Computer.
S. Mohan, India
Stepper Motor Failures Within
the first 6 months of purchase I had to return the scanner twice to
replace the stepper motor. The symptoms of stepper motor failure are a
loud grinding noise during scanning followed by the enlightening
"The scanner has reported a hardware error. The present function cannot be continued. Sense: 0x04620000"
Most scanners shipped have a lock on them to prevent the top from opening up and damaging the glass. This is a screw type mabey other but a penny fits in mine. This may not be the case for you but look in your manual to find the unlock device.
This will also in some scanners prevent the stepper motor from moving in transit . The stepper motor is the device thats makes the bar slide up and down to scan the page.
Hope this helped some.