PCI-E Cards: It’s less likely – but still possible – that a disconnected GPU or other PCI-Express device may be the reason your Windows 10 desktop has failed to start.

Press the SATA cables in firmly and make sure it’s also connected to your PSU.

OS Hard Drive: Another possibility is that your main Windows hard drive has disconnected from the motherboard (or the power supply).

Open your RAM bay (or PC tower), take the RAM out, and slot it back in to make sure it’s well connected. Modern laptops usually hold the RAM in a bay on the underside, which means you don’t have to open the entire thing to take a look.

Memory/RAM: RAM comes in the form of thin little sticks, which can be easily dislodged if you’ve knocked your computer around.

Here are the main components you should be looking at. If you’re getting a completely blank screen when Windows tries to start, then – if you’re reasonably confident – it may be worth taking a look inside to make sure that all the hardware is slotted in as it should be.

Nothing works on windows 10