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I have a HP laserjet 4600 printer that when I print from powerpoint it will print solid black lines randomly. Every 10 pages or so it will put a solid vertical black line down the page. I have tried updating the driver and that didn't work.

Clean the toner roller. Be careful and use a very soft tissue. If you are using refurbished rollers or at the end of the life of the toner cartridge, they will fail like this.

You may also consider a real Hp service tech or support center, this is a calculator group of geeks and you will only recieve suggestions such as above, not real support.