Ever wondered what happens when you press the power button on your PC or laptop? Understanding the boot process can help you recognise early signs of hardware or software problems. At Gatley Computers, we frequently troubleshoot slow startups, “no boot device” errors, and system failures. Here’s a simple, step-by-step explanation.
When you press the power button, the SMPS (Switched Mode Power Supply) sends electricity to the motherboard and other components.
Signs of a problem:
PC shows no signs of life
Fans don’t spin
No lights on the motherboard
If this happens, the power supply or motherboard may need checking.
The first program to run is the BIOS (Basic Input/Output System) or UEFI firmware. It conducts a POST (Power-On Self-Test) to check critical components:
RAM (memory)
CPU
Graphics card
Storage drives (SSD/HDD)
Keyboard and essential hardware
Warning signs:
Beeping sounds
Blank screen
Error messages like “No boot device found”
Once hardware checks are passed, BIOS/UEFI searches for a bootable device, usually your SSD or hard drive. It loads the bootloader, which then starts your operating system (Windows or Linux).
Problem indicators:
PC stuck on spinning circle or Windows logo
Bootloader errors
Your operating system begins loading:
Device drivers
System services
Startup programs
Causes of slow boot:
Failing hard drive
Too many startup programs
Corrupted Windows installation
Nearly full SSD
Upgrading to an SSD or cleaning unnecessary startup programs can dramatically improve boot speed.
When the desktop appears, your computer is ready for use. On modern machines, booting should take 30–60 seconds. Longer times often indicate a need for SSD upgrades, system clean-up, or hardware repair.
At Gatley Computers, we specialise in diagnosing and repairing:
PCs stuck on BIOS screen
“No boot device found” errors
Windows not loading
Blue screens on startup
Corrupted operating systems
Failing hard drives
Slow boot times
Laptop startup issues
We also offer SSD upgrades to improve performance for older machines.
We provide professional computer repair services across:
Gatley
Cheadle
Heald Green
Stockport
Didsbury
Wythenshawe
South Manchester
Businesses near Manchester Airport
Whether you’re a home user or a small business, we deliver fast and reliable support.
If your PC or laptop won’t start, don’t worry — most issues can be diagnosed and fixed quickly.
Visit us: Gatley
Call us: 0161 428 9000
Services we offer:
Same-day diagnostics (where possible)
SSD upgrades
Windows reinstallations
Data recovery
Business IT support
Trust Gatley Computers for local, reliable, and professional computer repair in South Manchester.
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