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Solve : PC Sometimes Stuck at BIOS?

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So I have a Compaq Presario as follows:

AMD Athlon 64x2 4200+ (2.2ghz)
3GB PC2-6400 RAM (2GBx1, 1GBx1)
ATI HD4550 512MB GDDR3
160GB HD
Modem
250w PSU
Windows 7

Sometimes when I try to power on the machine, it will get stuck at the Compaq logo BIOS SCREEN. It won’t advance past that. The first time, I reseated all the connections on outside of the machine and popped off the case. The machine booted into Windows normally. The problem then went away for a few days.

Today, the Compaq did the same THING again, GETTING stuck at the BIOS screen. This time I just popped the case off and the computer booted.

What’s the issue here? How can I got about solving it? What should I try first to resolve the issue?

Thanks for the help.
Quote from: shadou on October 12, 2009, 07:40:10 PM

...The first time, I reseated all the connections on outside of the machine and popped off the case. The machine booted into Windows normally. The problem then went away for a few days....
Now do the same thing inside the machine. Something is probably loose.
Remove and reseat all connections one at a time, including the RAM sticks.I decided to make sure the connections inside were tight and connected well. If the issue happens again, I will disconnect and reconnect everything one-by-one. I did notice a few connections that were a little loose, but nothing too out of the ordinary.You may want to upgrade your power supply. It's a little low for this type of machine.

Go with at least 450W or 500W

It's a store bought Compaq Presario. The PSU is what came with it.I switched off the "hidden boot" option in the BIOS so that it shows the hardware testing at the beginning and the problem has gone away (for now). I'll update if the issue returns.


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