Computer cannot boot to bios

Question

When I turn on my computer, it just goes go to a black blank screen. It only has an internal graphic card.

Upon further investigation, I noticed the fan intermittently stop and start again. Things I have done:

• Removed all peripherals, ram, etc but the problem still persists.
• Swap with a working RAM
• Reapplied thermal paste
• Blow dust

Don't know if I should:

• buy a new power supply to test

Thank you.

Answer 1

Follow these steps:

Check if The power supply (PSU) is busted - there is a way to test the PSU without connecting to a CPU- refer here: https://www.instructables.com/id/How-to-power-up-an-ATX-Power-Supply-without-a-PC/

If this fails - buy a new PSU If not - proceed to next step

The connections of the cables are not correct double check all connections in the motherboard are correct (RAM, CPU fan, PSU, GPU, etc)

Goodluck!

Answer 2

Disconnect all cables from the system, most especially the power cable. Let the system sit for a minute, then just reconnect power, keyboard, mouse, and video, and see if it boots.

if not, try a new power supply. Resetting CMOS shall also help.