That light sequence indicates a memory failure. You can try reseating the RAM and if that does not help then try one RAM module at a time. This chart has more information.
More information on CPU swaps can be seen in this forum page and here. It appears that the system does not support the 3rd generation CPUs.
Have you tried reinstalling the i5 2400 CPU to see if the system boots properly? And as computers go that is almost 9 years old and any upgrades are not going to be cost efficient.
Last of all if you are talking about Half-Life Alyx then the minimum specs are as follows, from this site. And those specs are well above the system you have.
"a Windows 10 computer with a Core i5-7500 or Ryzen 5 1600 or better, with a GTX 1060 or RX 580 graphics card or better. Those are high-end parts if you haven’t upgraded in a few years. You’ll need 12GB of RAM, though, which may be an upgrade for many gamers who were told 8GB was enough."
JOcean
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February 26th, 2020 15:00
That light sequence indicates a memory failure. You can try reseating the RAM and if that does not help then try one RAM module at a time. This chart has more information.
More information on CPU swaps can be seen in this forum page and here. It appears that the system does not support the 3rd generation CPUs.
Have you tried reinstalling the i5 2400 CPU to see if the system boots properly? And as computers go that is almost 9 years old and any upgrades are not going to be cost efficient.
Last of all if you are talking about Half-Life Alyx then the minimum specs are as follows, from this site. And those specs are well above the system you have.
"a Windows 10 computer with a Core i5-7500 or Ryzen 5 1600 or better, with a GTX 1060 or RX 580 graphics card or better. Those are high-end parts if you haven’t upgraded in a few years. You’ll need 12GB of RAM, though, which may be an upgrade for many gamers who were told 8GB was enough."