I have a T7610 that cannot POST, power light flash yellow, diagnostic LED 1-3 blinking, all fans are running fine, DVD drive is working fine as well.
Per the information below, the PSU may be bad. Tried to change the PSU, tried to change the Lithium coin cell battery, tried to pull off hard drive and RAM,  but still the same issue.
Any idea what the problem could be?
PSU may be bad or PSU cable may be crimped creating a short on a main power rail. (PS_ON asserted, PS_PWRGOOD not asserted)