Qualifying 13th for his first race since Abu Dhabi 2019, Hulkenberg was unable to take the start when Racing Point was unable to fire up his car, with investigations revealing a clutch bolt had failed and come loose within the drivetrain.
"It looks like a bolt sheared within the clutch housing," said team boss Otmar Szafnauer.
"And that bolt got caught and therefore wouldn't allow the internal combustion engine to turn over.
"So where the bolt fell off, it got jammed, and we couldn't turn the engine over.
"I think it's a bit early to understand why, but it did shear off so it could be a material issue, it could be an over-torque issue, I don't know.
"I'm sure all of those bolts are torqued to a certain specification, say the torque ratio isn't set right and you over-torque it, it could shear it.
"It could be a material issue in manufacturing, but until you look into all of those things - was the bolt brittle for example, I don't know - so we'll have to understand the root cause and make sure we fix it."
Szafnauer confirmed that the bolt was part of the package provided by Mercedes.
"It's not a Racing Point part, that's a part we get from either HPP [High Performance Powertrains] or MGP."