[trussler]

when i turn on my computer after about 20-30 seconds it switches off i have tried a new hard drive and a new power supply i don't know what to try next

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Hello trussler...

Take a look at the motherboard...next to the CPU you should see several capacitors (they look like little tin cans). Do any of them show signs of swelling or leaking?

Another thing that can cause this is the CPU itself. If the thermal compound between the cooler and CPU has broken down, the processor will rapidly overheat and shut down. If the processor is not damaged, this can usually be resolved by applying thermal paste.

Does your machine finish it's POST? (Do you hear a "beep or series of beeps"?)

wannabe1

[wannabe1]

Hello trussler...

Take a look at the motherboard...next to the CPU you should see several capacitors (they look like little tin cans). Do any of them show signs of swelling or leaking?

Another thing that can cause this is the CPU itself. If the thermal compound between the cooler and CPU has broken down, the processor will rapidly overheat and shut down. If the processor is not damaged, this can usually be resolved by applying thermal paste.

Does your machine finish it's POST? (Do you hear a "beep or series of beeps"?)

wannabe1

[trussler]

thank you for your reply when i turn it on it single beeps and then it is followed by a double beep

[wannabe1]

trussler...

Chances are the second series of beeps are indicating a problem with the video. Try entering the BIOS Setup and restoring the Setup Default settings (on many versions of BIOS this is done with the F5 key). Save your settings (usually F10) and exit BIOS. See if the machine will then boot.

wannabe1