Generally this is a video driver issues (since it presented in normal mode, but not in Safe Mode). Although you may have the most updated driver, one of the settings in the drive could have become corrupted - so installing a copy of the most updated drive is the most common remedy (even if you have the most updated driver installed already)
The Dell drivers aren't necessarily the most updated driver (those at the Intel website are the most updated). My next suggestion would have been to try those drivers. They're the most updated for that card, and they don't contain anything that Dell may have added to the driver.
The system restore most likely reverted you to a previous version of the driver that doesn't suffer from the problem that the current Dell driver has.
Anyhow, it's fixed - and that's what counts!
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